I thought this was too good to be true.... and unfortunately it was. The mouse still makes a very audible click with the left button, although it's a 'softer' click and not so annoying - but the right mouse button is almost inaudible. If the left button was as quiet as the right, this would be the perfect 'silent' mouse. If you change the mouse settings and can get used to using the 'wrong' buttons on the mouse it is almost silent, but old habits die hard for me, I'm afraid. Wheel can be heard, but again, not as loud as on my previous mouse wheel. Feels comfortable in the hand, it's light and responsive and quick.
I bought this because my partner complains about my clicking while he is trying to listen to the TV or radio (I REFUSE to be banished to the bedroom) and I think if he turned the volume up a bit he wouldn't be able to hear it quite so much, although I wouldn't go so far as to say not at all.
Hope this doesn't sound too negative, as it is an improvement on my old mouse (a Microsoft), but not enough of an improvement to rate it as excellent or really recommend it as 'silent'.