Pros: Very comfortable mouse to use. Smooth and accurate. My hand does not hurt regardless of the amount of time I sit using it.

Cons: I tend to push the left side button accidentally. Had to disable it. That could be a personal problem and might not be a con for you.

Pros: Detection seems good and installs quickly. Low system resources so it did not slow down my Windows 8.1 computer.

Cons: Feels clunky and somewhat unstable. Has issues when transferring files to USB drives and takes a long time to release the drive so it can be removed properly. The Windows update settings turn on and off for no apparent reason and it has to be related. Never had any of these issues without this software installed. Also, it keeps picking up the same virus like it can't get rid of it. Perhaps a false positive.

Overall Review: It's close to being good and with a few tweaks by the programmers, it probably will be. Even with the clunky stability issues, I think it's better than the free solutions. If you find a screaming Newegg sale price, it's worth it. It's most certainly not worth the full retail price.