Rating: 
Summary: No complaints here! I love this thing!
Review: I have been using this mouse for around 3 years now. I have one at home and one at work, and between losing parts, damage, etc. I have probably bought around 8 of them total. It's like putting on an old glove that is fitted to your hand - completely ergonomic and your hend gets used to it after a while ---- I don't think mine moves anymore or has in a long time.Great for tired hands or sore wrists. Also easy to clean (which is RARE for a mouse).
Rating:
Summary: Logitech got it right
Review: I have had mine for years and it is still going strong. Never had a problem with it. If you like to only move your thumb this trackball is for you. Once you go trackball you don't go back.
Rating: 
Summary: Great ergonomic trackball with quirks
Review: I have had this trackball for over one year now. I've used the wired-USB version for my work laptop, so I wanted the wireless for my home laptop. The ergonomics are great. Like many others, this mouse fits your palm like a glove. Originally when I first started using trackballs, it took some getting used to, but once you get the feel for it, you'll be a trackball (more appropriately a "thumb-ball") pro.
The buttons are well-located, convenient, and comfortable. You really don't feel like you need to hyperextend or move any of your digits to perform functions. The only digit of your hand that is active is your thumb.
At its best, I have found the range on the trackball to be excellent. I have a desktop docking station for my laptop. I have the RF station hooked up to my dock. I can sit on my couch on the other side of my home office (6 - 7 ft away) with my laptop undocked and the trackball responsive at my side. Great responsiveness for a reasonable range.
Now the quirks (keep in mind I have had this for over one year): sometimes the mouse becomes unresponsive and sluggish; the mouse pointer slows down, clicking may not work, and sometimes entire sections of a page may highlight simply by moving the pointer over a page. If the mouse is acting up, I've also found that shaking it around kind of helps ;-) That is my first line of triage for the mouse. If that doesn't work, I've found myself replacing the battery maybe 3-4 times over the past year, "resetting" the RF signal (you simultaneously push these little buttons on both the RF station and on the actual mouse).
Another quirk/maintenance: mouse-lint builds up inside the trackball on the little nubs that hold the ball up. Also, its good to clean the optical sensor window now and then as that can accumulate dirt and oil as well.
Since I have both the wired and wireless versions of this trackball, I can say that the wireless one is not as crisp and responsive as the USB-wired one, but it is not noticeable when the wireless is working at its peak condition.
This is a great trackball for ergo-lovers. The quirks are tolerable. I'd love to see a bluetooth version and see what the performance difference would be!
Rating:
Summary: The Best Possible Mouse Option
Review: I love this mouse. Is that reason enough for you to want one too? Maybe not. So, I'll explain. The design is perfect. It fits my hand nicely. The buttons are easy to use and I'm never accidentally hitting one when I mean to hit the other. And that track ball! Superb! Yeah...it could be slightly more smooth but keeping it clean and not being too intense with it have helped me operate it without any real difficulty. Besides, the fact that I don't need to move a mouse all over the place is just so wonderful. Holding it still and just manipulating the track ball is definitely my style. I'll admit that regular mouse use isn't the ultimate in drudgery....but if you try this mouse, you'll never be satisfied about another mouse with less to offer again. The only feature I'm not wild about is the scroll wheel. For fast scrolling it is great...but when you want to scroll just a tiny little bit, rely on holding the right mouse button down and working the track ball -- similar to what you'd do with a conventional mouse. But there is so much to appreciate in this gadget. The very fact that it is wireless for instance. I've always been irritated when a conventional mouse cord got in the way of other things on my work area. No problem here! I also think the design of this mouse is wonderful. It just looks cool. Another plus. If you're looking to replace an older mouse, consider this one. And I hope you will love your's too!
Rating:
Summary: perfect for limited space
Review: I love this trackball mouse. I have been using Trackman Marble Wheel version for the past few years. It was great also, but with limited desk space at work, the Cordless version is better. With a keyboard, calculator and books/binders/papers needed on my desk, it is easy to get the mouse out of the way and still use it. My next goal is a cordless keyboard! The only complaint that I have is that the "wheel" button from the Cord to Cordless has been reduced in space. It used to occupy a almost full size button space, and now only the wheel itself is placed in between the R and L buttons. Your hand used to be able to rest with index, middle and ring finger on L, Wheel, and R buttons. Now, you really can only use your index and middle fingers on the R and L and move one of them to the wheel when you need it. I do not find it as comfortable. But, I can live with that inconvenience in comparison with the benefits.
Rating:
Summary: Give Your Wrist a Rest.
Review: I swear by this thing. I can sit back and read my email and peruse the internet without having to have my hand/wrist in an awkward position. You can set it just about anywhere you want. No more sliding my hand back and forth with a mouse. I barely have to move my thumb and fingers to get this baby sliding my cursor around. The added Mouseware software is highly customizable and easy to use. If you're a gamer you may not like using a trackball but, for everyone else this is a must. No wires to get tangled and best of all no sliding your wrist all over. The battery life is pretty darn good. They'll last for months literally. All in all a great purchase.
Rating:
Summary: Trackman Wheel
Review: I want one, but I am left handed. Won't Logitec ever make one for us lefties??
Rating:
Summary: good tb
Review: I'd like to echo the complaints about installation. I'm an experienced user/tech and the space to activate the acceptance is new to me also. The response I get with this is excellent through the pS/2 port and it has a good feel. I am partial to trackballs though. Some just can't adapt. My only nitpick is that the scroll wheel is a little to notchy for my taste. Good remote pickup also.
Rating:
Summary: works great
Review: i've had this for a couple of months now and it works great with my mac. i've had no problems with interference at all even with my cordless phone, cell phone, wireless router and laptop (with a different cordless mouse) all on & working within a foot of each other at the same time. another good product from logitech.
Rating: 
Summary: Logitech discriminates against lefties!!!
Review: I've recommended this product to right-handed customers and friends, but being left-handed myself I can't use it. I've called Logitech to see if/when they'd produce a left-handed version, but the representative I was dealing with basically just laughed in my face. Get a clue guys. Lefties might not a huge percentage of the market, but do you have any IDEA how much customer loyalty you'd get with marketing a product that's ergonomic for US?!?!?
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