I use this mouse every day at work, it is very precise and has a good battery life. I charge it once every 2 weeks.

It's really hard to find a good trackball mouse these days but I picked this one based on it's features and price point. It can support up to three devices but the active device selector buttons are on the bottom of the mouse instead of the topside which is really annoying if you need to easily switch between paired devices on the fly. I like it that the mouse is rechargeable, but I have to recharge it more often than my other rechargeable mice so perhaps the light ring surrounding the trackball drains the battery faster than mice without lights. The trackball falls out easily but it pops right back in. Performance wise the mouse is responsive but the button clicks are easily heard in a quiet space which may be disturbing for some people. Overall I've been happy with this mouse even with it's minor design annoyances.

If you like the Microsoft Trackball version this one is the replacement for it. I bought another version first but no matter what you do to clean it it starts sticking on the ball and becomes unusable after a few minutes.The only downside for this one is the buttons are not programable but basic functions are there.

This is my second tracking ball mouse. Only difference is the other one does not have lights. The battery drains quicker and the tracking ball is a bit stiff. I have cleaned it and it still if stiff.

I have a physical disability that affects my joints. Not having to constantly move my arm, means I have far less pain related to computer use.