Solid, quality feel e.g. braided cable cover. Noticeably, but not dramatically, smoother and more precise than my el-cheapo mouse. Installed seamlessly, automatically including my ancient Logitech G15 keyboard. Minor quibble: The default profile source was On-Board Memory rather than Automatic Game Detection. Must be plugged directly, not through a USB hub like my ancient G15 keyboard.
More a super-mouse than a keyboard substitute. I use my left hand on the keyboard to move for circle strafing. I use my right hand on the mouse for target selection, using the G600 I can fire with my right hand without switching to the keyboard.