Well made, good alround feel.
Very well built, unlike some plastic mouse items. Unlike some this is a good strong design, well constructed and has a nice feel about it. During high action games, this doesn't get sticky and retains sharp response to your movements. The added weights inside are a good feature which I personally like. It give the mouse, a good feel far better than the light ones around.
There is a download app you can but on your PC, to allow you to change the LED lights on the mouse, and also the arrangement to configure your own keys to mouse ratio.
The Kevlar coated feet are great on any surface,(The app has the option to configure surface differences).
The centre mouse wheel has the option to make it have a smooth effect or ratchet effect while been spun. I found the smooth option "with out the clicking sound" to twitchy, or easy to move out of place, no good for action games involving sniper modes. The clicking sound is pretty quiet, but has a crisp feel to it.
there is a button, mounted lower on left side of the mouse, this is meant to be" According to Logitech" a sniper button or Sharpe shooter button. I found this hard to use with my thumb, in conjunction with the normal top left and right button. Maybe its for a smaller hand,IMHO I would say have a wide span hand, but nothing abnormal :).
Overall, strong, sturdy and a good example of part of the line in the LOGITECH family.
best regards to ALL.