This may be my new favorite mouse!
I bought this mouse because I had the Trackman Marble and not having a scroll wheel just wasn't cutting it. I was trying to play a game (Sims 4) with it and I could not zoom in or out - done via a scroll wheel. I could set the extra buttons to auto scroll but the game didn't recognize that.
Enter this mouse. I have the convenience of a wheel, the ergonomics of a trackball, and STILL have a couple extra buttons to designate! The game detects the use of the extra buttons just fine, and I can play fully without even touching my laptop. Obviously for regular use (such as surfing the web) everything works fine too.
Having it cordless is FANTASTIC and I have yet to have any issue with the mouse not communicating with or connecting to the dongle. The single AA battery it came with has yet to be replaced even once - it chews through batteries at about the rate of your average TV remote - that is, VERY SLOWLY. it has been 95% every time I have checked.
The couple minor negatives - sometimes the mouse is a bit skippy. The ball doesn't seem to roll as smoothly as the Trackman Marble but perhaps that is due to a size issue or the design. Even that is also a positive because the Trackman Marble ball pops out too easily, but on this mouse the ball takes a bit of push to get it out.
The slight skip at times is really only an issue if you are trying to do very precise work. For example, graphic design or photo editing - you may have to zoom in to your image more to allow a bit more give. But I've used it for that too and if you keep it clean and aren't doing super precision (pixel level) work, it still works beautifully.
In case it isn't obvious, I highly recommend this mouse. If you are a lefty (as I am) but you can't accommodate a right-handed mouse then you would be probably the only demographic I wouldn't suggest this to. If you can accommodate a right-handed mouse - buy it!
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