My thoughts after about three months' use.ERGONOMICS:My hands would be average size for a 6'0" (183 cm) tall man. At my hand size, this mouse works for fingertip (which I use) or claw grip. Palm grip would work only with smaller hands. Surface texture has good grip, a little bit rubber-like. The "seam" on the side is actually a comfortable notch for the thumb. The positioning of the buttons is very good for me, easy to reach but won't get accidentally pressed.As a left-handed mouse user, my options were limited, but I like this one enough that I would be happy with it for right-handed use.BUTTONS:Buttons are positioned well and have a good amount of pressure- not too hard to press, not likely to accidentally press either. The scroll wheel looks sharp and angular in pictures but actually is quite comfortable. It does not have side tilt functionality.The Easy Shift button is one of the greatest mouse-related inventions! When you hold Easy Shift (ES I'll call it) and press any other button (or the scroll wheel), it is a different set of functions. For instance, ES+right click can do something different from right-click, and ES+scroll can do something different than scroll. So it's like having 20 buttons, except in fewer places. Takes a little while to learn all your functions but it's worth it. You can set any one of four buttons to ES.PERFORMANCE:I am a garden variety power user and not a gamer, so I really cannot say much about tracking. I only use 2250 DPI and 400 DPI (for precision clicks), and I have had no need for anything higher. I do prefer to have mouse acceleration, and this mouse has that option. The weight of the mouse is unremarkable, neither heavy nor light. There is no adjustable liftoff, which I would have liked since the liftoff distance is rather high.SOFTWARE:On the whole, the Roccat Swarm software for the mouse is powerful and intuitive. There are built-in functions such as internet stuff, but you can also customize a macro for it and have the mouse trigger the macro. (macro = programmed sequence of keystrokes) The scroll wheel can be configured to slider-type functions, such as DPI or audio volume. I have one button to act as "Ctrl", and Ctrl+clicking works fine.I do have a Roccat keyboard, and Swarm for the keyboard is tricky and buggy, but I'll note that *for this mouse* the software works pretty well.AESTHETICS:The lighting can be fantastic, or it can be awful. Fluorescent colors like red, yellow, hot pink, bright green are vivid, bright, and evenly lit. Slightly darker than they should be but those look good. If you hold down the ES button, the lights turn cerulean blue. Custom colors are very hit-or-miss. Dark purple looks like light pink, white/light yellow has a pinkish tinge. You can't actually make white, and dark colors in general don't work well at all. Sometimes you can drop one of the RGB values by 40 points and make no no difference, while other times you only have to drop one point at a time to make a big change. You don't really get 16.8 million possible colors, it's probably a couple thousand. Sometimes custom colors look just fine, other times they're awful, so with this mouse you can't count on those looking good. The lights look great if you stay with the software's recommended presets.There's no glare or lighting angle distortion on the pictures; the light color actually looks like that.Everyone's use will be different, but this mouse does very well for my needs as a power user. Between precise, consistent clicks and the many programmable buttons (all of which I use regularly), I can operate the computer far faster than before, particularly internet browsing on a few windows at once. Don't have to lift my heavy arm back and forth from mouse to keyboard as much.