Rating: 
Summary: cheap and easy
Review: Accurate little optical mouse. I plugged into an xp laptop and it worked right away (i didn't install the logitech software). The scroll wheel is stiff and loud, but the minor modification described in one of the previous reviews worked great.this mouse replaced the microsoft basic optical mouse (same retail price) which never worked properly (the pointer would jump around constantly).
Rating:
Summary: cheap and easy
Review: Firstly, to those who complain about the scroll wheel being slow and unresponsive -- it seems to be an issue with the drivers. However, I found an option in the Control Panel/Mouse section to revert back to MS style controlling. That seems to fix any issues I had while still retaining the extra 4th button functionality. I'm still a little confused why that option is there, or why Logitech drivers seem a little sluggish in the first place; but it's fixed and I can't complain. Secondly, to those complaining about the really loud clicking wheel -- that can be easily fixed. I have to say if you purchase two identical mice from the store and turn the scroll wheel; there will be a good possibility that one will make a louder noise than the other. This is just part of the manufacturing process and it all has to do with a little springy wire that makes contact with the inner part of the wheel. I'm sure this has a possibility to void your warranty -- so beware of that aspect. But personally, I found it a very simple process to fix. What I did is: 1. unplug the mouse from the computer
2. use a small phillips screwdriver to remove the screw accessable from the bottom of the mouse
3. carefully pull up and to the rear of the mouse on the front cover to remove it -- DO NOT pull it off all the way because there's a wire connecting the top to the bottom.
4. unplug the little connector that plugs the 4th button on top of the mouse to the main board (this might be optional if your wire is long enough to give you clearance and depending on how big your fingers are)
5. take a good look at how the wheel is situated in its socket -- beware of the small spring (it most likely will not cause you problems, and is easy to put back where it goes but don't lose it)
6. lift up on the wheel module and remove it
7. there will be a little wire that goes inside the wheel and has a curved edge to it .. THAT is what causes the clicking sound and gives the wheel its "resistence" at every click. Here is a photo of the Logitech wheel structure and the resistence wire: http://www.dansdata.com/images/ltmscordless/doohickey440.jpg (cut and paste into a browser)
8. simply pull it out from its housing (this is easy to put back into place also) and use a pair of needle nose pliers to give yourself a good hold on the wire and bend it down *VERY SLIGHTLY* near the top where it makes contact with the inside of the wheel ridges
9. test the resistence until you have it clicking/sounding the way you prefer
10. put everything back together the way you had it It's not a very complicated modification, and you are simply making the mouse more like some of the others off the assembly line that got their wheel spring put in that was bent further down. I've experienced this issue with Microsoft mice as well. Good luck -- and be warned, I am not responsible for any modifications that go wrong! Also, this mouse is the best I've ever used. I don't like all those extra useless buttons found on the more expensive mice.. the 4th button does seem to have some possibility for usefulness -- you would probably avoid curling your index finger down to hit it by instead shifting your hand slightly to use your thumb. One last thing, the RESPONSIVENESS OF THE MOUSE IS AWESOME -- BETTER THAN ANY OPTICAL MOUSE I'VE USED!! I think the increased responsiveness is obviously due to their new optics engine.
Rating:
Summary: Best Mouse on the market for what it does
Review: Firstly, to those who complain about the scroll wheel being slow and unresponsive -- it seems to be an issue with the drivers. However, I found an option in the Control Panel/Mouse section to revert back to MS style controlling. That seems to fix any issues I had while still retaining the extra 4th button functionality. I'm still a little confused why that option is there, or why Logitech drivers seem a little sluggish in the first place; but it's fixed and I can't complain. Secondly, to those complaining about the really loud clicking wheel -- that can be easily fixed. I have to say if you purchase two identical mice from the store and turn the scroll wheel; there will be a good possibility that one will make a louder noise than the other. This is just part of the manufacturing process and it all has to do with a little springy wire that makes contact with the inner part of the wheel. I'm sure this has a possibility to void your warranty -- so beware of that aspect. But personally, I found it a very simple process to fix. What I did is: 1. unplug the mouse from the computer
2. use a small phillips screwdriver to remove the screw accessable from the bottom of the mouse
3. carefully pull up and to the rear of the mouse on the front cover to remove it -- DO NOT pull it off all the way because there's a wire connecting the top to the bottom.
4. unplug the little connector that plugs the 4th button on top of the mouse to the main board (this might be optional if your wire is long enough to give you clearance and depending on how big your fingers are)
5. take a good look at how the wheel is situated in its socket -- beware of the small spring (it most likely will not cause you problems, and is easy to put back where it goes but don't lose it)
6. lift up on the wheel module and remove it
7. there will be a little wire that goes inside the wheel and has a curved edge to it .. THAT is what causes the clicking sound and gives the wheel its "resistence" at every click. Here is a photo of the Logitech wheel structure and the resistence wire: http://www.dansdata.com/images/ltmscordless/doohickey440.jpg (cut and paste into a browser)
8. simply pull it out from its housing (this is easy to put back into place also) and use a pair of needle nose pliers to give yourself a good hold on the wire and bend it down *VERY SLIGHTLY* near the top where it makes contact with the inside of the wheel ridges
9. test the resistence until you have it clicking/sounding the way you prefer
10. put everything back together the way you had it It's not a very complicated modification, and you are simply making the mouse more like some of the others off the assembly line that got their wheel spring put in that was bent further down. I've experienced this issue with Microsoft mice as well. Good luck -- and be warned, I am not responsible for any modifications that go wrong! Also, this mouse is the best I've ever used. I don't like all those extra useless buttons found on the more expensive mice.. the 4th button does seem to have some possibility for usefulness -- you would probably avoid curling your index finger down to hit it by instead shifting your hand slightly to use your thumb. One last thing, the RESPONSIVENESS OF THE MOUSE IS AWESOME -- BETTER THAN ANY OPTICAL MOUSE I'VE USED!! I think the increased responsiveness is obviously due to their new optics engine.
Rating: 
Summary: Good mouse
Review: I bought my MX300 from the local Best Buy (30$ and a 15$ rebate on the way). Previously, I used Logitech's basic optical mouse (a great mouse for a great price) and there doesn't seem to be much of a difference. I'm not much of a gamer (there may be a difference for these people), but there doesn't seem to be much of a difference except for the additional programmable button (which I do not make much use of). I just use Alt+Tab to change windows anyway. I guess the only thing that made me buy this mouse was the sharp black and gray colors. So if you have a black or gray monitor or computer case, buy this mouse.
Rating:
Summary: The best mouse
Review: I bought the logitech mx300 at my local Best Buy. What a great investment. I have had no problems what so ever. Its comfortable, its buttons are well thought out, and are easy to click and silent. Its very responsive in the games i play online, and the image reading is AMAZING!. I think people should feel the mouse before they buy, cause its kinda ripping off other people, use it a day, don't like it, return it. All in all, its an awesome mouse
Rating:
Summary: Does What I Need for the Price
Review: I bought this mouse as a gold box offer because I had been frustrated with the constant need to clean my old, mechanical mouse. I've only used it for a few days, but they have been really good days. The mouse points where I mean it to point without ever sticking, and that alone makes it worth my money. I installed it without the drivers, so I can't use the windows button, but it points and clicks reliably and the scroll wheel works fine, which puts me well ahead of my old mechanical mouse.
Rating: 
Summary: The wheel is slow and loud
Review: i had an old simpler version of logitech product, optical wheel mouse. and this new mx300 mouse performs even worse than that one. the buttons are rather similar, even tho not as conveniently protruding as those on my old mouse, they are okay. the wheel is the problem. first, it's loud, clickier than the regular logitech optical wheel mouse. second, the logitech mouseware makes it very slow in responding. i used it to browse webpages, and it not only lags but also slips way too often. i took off the mouseware driver, it works better, but then the nice little extra button doesn't work anymore, which kills the point of buying this one rather than the regular optical wheel mouse, plus i have not observed any difference with this "mx engine". the only reason why i didn't return it is because i need to pay shipping for it, and i am hoping the clicking will be smoother with aging. but other than that, i don't see why this will be a better product than the optical wheel black/blue, which is cheaper if you buy from a store.
Rating:
Summary: Technically: A+ ; Ergonomically: not for everyone
Review: I had no problems with installing this mouse, and kind of liked the function of the small button, which lets you flip between open applications. The problem I had, which made me return this mouse the next day, was the fact that my hand went numb after using it for half an hour (to be fair, I have had tendinitis in my wrist and elbow before, so I may be more sensitive to a mouse shape than others). The scroll wheel was a little further back than my other mouse, the buttons were set back from the front a little (so my hand could not rest over the front of the mouse and still hit the buttons), and the shape was not comfortable. This mouse will probably fit great in a woman's hand, but not in mine. I'm no giant, either (I can palm a volleyball with ease, but not a basketball). The Labtec Optical Mouse, at ..., is a far better deal. I can't notice a difference between the two as far as speed and accuracy are concerned.
Rating:
Summary: great product
Review: I love this mouse and all its features. The buttons click very smoothly and quietly. It actually has five programmable buttons as the scrolling wheel can be pushed down for another function. On a Mac you don't need the right click button for anything so I reprogrammed mine for a double click which comes in handy for opening programs or rolling up the window shades. It sure beats the hockey puck shaped mouse that Macs used to come with and while I looked at Apple's optical mouse I couldn't see spending "alot of money" for a mouse that wasn't programmable. Logitech makes good products and I know I'll be happy with this mouse for a long time.
Rating:
Summary: for a first person shooter gamer this is the thing
Review: i play quake 3 arena a lot and this mouse is the best i've used, it doesnt slide when you run your hand too fast and it fits your hand perfectly.
i have also read loads of reviews and it seems to be one of the most popular amongst professional gamers!
its also a very good price at Amazon, ive checked other places and it costs up to £37!!! amazon is certainly one of the cheapest.
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