Hmm ... 7

The pros:
purchased as a desktop mouse; good ergonomics for my hand (woman, pretty little hand) even if I preferred my old Logitech (LX 7, larger, heavier). Rather light mouse; aesthetics (black with red stripes); installed and recognized in 10 seconds (in Windows 7). On / off button below handy. Scroll scrolling good, but not too quickly. Traction and perfect precision (on mousepad Amazon) Setpoint software (download) to set the scroll options and forward / backward (as I do not use). Unifying system to "connect" another product of this range (like a keyboard) without further "connection" usb (at least I hope so because it will be my next purchase ...).

The -:
cliques NOISY! (Really), scrolling scroll quite noisy too !!! Quite expensive.

In short, a decent mouse for office (small enough for a laptop, limit too small for intensive use with a desktop computer) but nothing revolutionary and quite expensive for the few proposed option (right / left ...) and the noise it makes. I hope at least that the batteries will make use as advertised on the website!
Note that I am going to keep my old Logitech (LX 7 = SILENT) for now. I bought it for my LX 7 gives worrying signs of fatigue after 2 years ...