This is a great mouse; it feels great in the hand, and just looks really cool. The resolution indicitaor lights on top look cool, and the flowing multicolor lightbars on the bottom look really slick as well. The thumbstick on top is especially nice, and is really great for easily adjusting the map in RTS and tactical wargames (such as BattleTech, which I play A LOT.) The bottom two thumb buttons are placed just a bit too far forward and can be a little hard to reach, but that will depend on the angle of your arm and how you hold the mouse (they would be much better if they were positioned just a bit further back, closer to the palm.)I got this mouse because about two months ago I suddenly developed a really bad case of tendonitis in the middle two fingers of my mouse hand, to the point that my finger knuckle went *CLUNK* every time I bent my finger, and eventually I couldn't even close my fist. I had seen upright ergonomic mice like this before and thought they looked cool but I never had a reason to justify the cost of buying one before, but when I developed the tendonitis I decided I'd give one a try to see if it helped. And thankfully after starting to use this mouse instead it cleared up after a few weeks.I had initially worried that it would be hard to get accustomed to this new style of mouse with my hand in a different position, but I quickly realized that it was actually easier for me and gave me even more control than with a standard mouse; the position of your hand on the mouse allows you to rest the heel of your palm on the mousepad, allowing you fine precision control over the movement of the mouse. You just need to make sure that your mousepad has a surface that isn't too slick or the mouse can slide all over the place the moment you take your hand off it.I only wish it was wireless, since I use a laptop that I literally sit on my lap and the cable can get in the way, but that isn't any kind of complaint against this mouse in particular; the cable is actually really nice and coated in a woven fabric material that keeps it from getting all tangled and knotted up.Overall it's a really nice mouse, and I consider it well worth the price.