My review about it's "Silent" part since I am guessing this is why most people will be buying this (otherwise just buy M235 which is quite good and half the price with discounts) :- Clicks are silent as mentioned, but only left and right clicks are silent. Click by scroll wheel is NOT that silent, and the scroll wheel is NOISY while scrolling.
I don't understand why after spending resources in making left and right clicks silent, Logitech left scrolling so noisy and with noisy clicks !!!