I compare with the good old M185. So, except for the silence of the buttons, the M220 mouse loses in everything. Noisier rides on the table! The wheel generally spins with some rather loud unpleasant sound of rubbing plastic. This loud scrolling nullifies the whole idea of silence, it's a MARRIAGE of the entire part. Disappointed with purchase The sound of the scroll wheel became unbearable. As a result, I rearranged the interior (a board with a sensor) into the body of an old M185 mouse - and thereby solved the problem of a noisy wheel. The wheel is attached to the top panel of the case. In the photo, m220 with the insides from m185 But Logitech certainly disgraced itself. The price of this craft is 550, no more.