Sure anyone new to it always wonders what it is or how to use it, but I absolutely love it! once you get used to it having your hand stationary, and having it be so reliable is fantastic. downside. you have to clean the guides occasionally as they get dirty.

Fundamentally, this a good product. It is conceptually sound, however it does throw a curve every now and then. It will seem to be working as expected, and then all of a sudden, it isn't. Then it usually comes back if you can be patient.

For the past 12+ years, I have been using the corded Optical Trackball that Microsoft made and then discontinued. Seems like everything they make that has a proven track record gets discontinued with them (Win98, XP, Win7, etc)! I couldn't find anything that had the same configuration until now!

Overall I am happy with the initial performance of the mouse, but it has given me a few problems the longer I have had it. Advantages: Initially the trackball is smooth and works perfectly. It helped me a lot with the wrist pain that I had from my old mouse.

I purchased this simply because I wanted to try a trackball. It is now my most-used input device. It is very comfortable, moreso than most traditional mice. Part of this is due to the shape of the trackball, but the fact that the hand stays stationary is also a factor.

- Excellent battery life (2 months and counting!; - Very comfortable

- Limited performance compared to some "regular" mice; - Poor scroll wheel

Can't be used as a regular mouse to move on a mouse pad. Only the scroll wheel can be used for that. That is the biggest drawback. Wouldn't recommend to anybody.

I've been using Logitech's Track Ball since before it went "wireless"; well over 10 years. I went wireless with the Model M570 several years ago. I have one for each of my five PCs but needed another for my Chromebook.

Logitec really went down hill. I have an old roller ball mouse that has the cord and it still works fine. I spend 40 bucks on this wireless garbage and it didn't last 6 months. To hell with you logitec I will be purchasing from another company.

It worked for a while

It didn't last 6 months and died!

I bought this mouse back December 2010. It has been used nearly every day as my gaming mouse for WoW, Overwatch, Sims ect... and just now the click buttons are starting to go. As stated by others, just pop out the mouse and clean the sensors once in awhile.

It's biggervthan I expected but as soon as I used it, my wrist and hand were relieved from the usual pain caused by holding a traditional mouse. If it was a bit less bulky it would be a 5star product.