Rating: 
Summary: decent mouse if you get one that isn't defective
Review: It has the great convenience of being wireless with good range. The battery life appears to be decent, approaching a month of hour a day usage. It is definitely not a mouse useable for gaming. It doesn't have the response nor the precision required. I would have given it 3 stars had it not stopped working.
Rating:
Summary: Don't waste your money
Review: Looks good, but performance leaves a lot to be desired.
From the start, the tracking was poor, about on the level of a traditional mouse which needs its trackball cleaning -- jerky and eratic cursor movements.Over time, the left button started to not register a click -- which seems really like a driver problem, because holding the button down does register as a "button down", but a click would not work all the time. Very frustrating. Now it had just stopped working altogether, which is sort of good, because now I don't feel so bad about throwing it in the trash and doing what I should have done from the start - buy a Logitech wireless mouse...
Rating: 
Summary: Not jumpy for me now....
Review: I have read some of the other reviews and a lot of people seem to think the cursor is jumpy. When I first used it I had the same problem. The cursor would sometimes fly across the screen or skip off in a different direction. I installed the IntelliPoint software and was reading the introduction. They said not to use it on a reflective surface. I thought this might be my problem and got out my old mouse pad that had a picture of vegetables on it. Since the top of the mouse pad was nylon it was definitely not reflective. After doing this, the performance improved greatly! The cursor almost never skips or jumps now. If you are using this mouse and are having performance trouble, this is what I recommend-
1. Install the IntelliPoint software.
2. Use it through USB.
3. Keep the receiver closer than 6 feet.
4. Use it on a non-reflective surface, unlike a finished wood desk, plastic, etc.
Rating: 
Summary: Was OK, now useless
Review: Was using it with my Powerbook and it was OK. Unlike the other comments, I didn't find it to be jumpy at all however the accelleration could have been faster. Now 60+ days in the left button won't work. Tried new batteries, tried different PC. No dice. I have the full blown Explorer Mouse for a year now with no problems and have never killed a button on any mouse before. Now out of warranty and having tossed the box I'm out of luck. A lesson learned for cheaping out!
Rating: 
Summary: Fantastic... If only the first two would have worked....
Review: This mouse is really great, it offers a lot of benefits. Although the pointer may get a little jumpy at times, it is still a great buy that matches perfectly with a Natural Multimedia Keyboard (also by Microsoft). Because I had problems with my first two devices I'm not giving it 5 stars, they simply didn't work, but the third was the one... and I'm really happy with it. Recommended
Rating:
Summary: Don't bother
Review: Easy to install, but annoying to use. Seems to have a delay before the cursor moves, then kind of catches up to you.
Rating:
Summary: you get what you pay for
Review: This mouse is designed for both right and left handers. That means your left handed friend can use it without lots of pain, but that also means the other 99% of the time you use it with some pain. Its not worth it. If you are right handed go for the asymmetrically designed Intellimouse Explorer. Also, mine would skip, lag, and had other serious technical problems. It got returned...
Rating:
Summary: The best of current mouse technology
Review: I have long enjoyed the wired optical mouse from Microsoft. Recently I got my grandfather (who is missing a thumb on his right hand) the non-optical version of this mouse (this wasn't available yet) and it really made the difference for him! He was surfing the net more and shopping online just because he could easily pull it over and use it with his left hand. With this version being wireless AND optical, there is no reason not to spend the ~$30 to get the best in mouse technology. No jitters and easy to use ambidextrously. Just don't buy it from Radio Shack (one of the other reviewers gave the mouse a bad rating due to their buying experience) :) The receiver for the mouse is about the size of a mouse, but it works 3+ feet away without a direct line of sight -- so no worries!
Rating:
Summary: Loving mine after a week!
Review: After spending a week with mine, I can't imagine being without it. Unlike others, I haven't noticed the slightest jumpiness. Battery level is still listed as "good" (best you can get) after a week of fairly heavy use. Not sure how much of this has to do with the fact I'm using it with a Mac instead of a Windows machine, but bottom line is that I really, really like it. It's also more comfortable than the Apple-supplied optical "Pro" one-button mouse I had been using previously and the extra button and scrollwheel don't even need to be mentioned.
Rating:
Summary: More clutter than a standard mouse!
Review: I was very surprised upon opening the wireless mouse packaging to discover that the receiver (with very long cord) is about five times the size of my wireless network card. I cannot understand why a mouse would require such a large receiver. Furthermore, this totally defeats the purpose of buying the product if you want to reduce cords and clutter. This should be shown in the product information provided.
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