The rattle of the battery cover is indeed NOT EVEN!
Sorry, love Logitech's engineers, but that can not be serious! Has been so often criticized here, but it's that bad, I did not expect: The rickety cover gives the whole hand a "feeling of insecurity". Completely unacceptable! I have pasted all 4 claws holding the cover is attached to the mouse with a little duct tape. So that the cover is firmly seated nicely and can continue to open as Custom. Otherwise, the mouse would have fallen!
The high-gloss finish, though looks after unpacking nice but is not pleasant to the touch (finger stick) yet easy-care (you can see every fingerprint)
Otherwise it is ok, does what it should. One recommendation they however do not get.