I totally love the form factor (even if I don't use it for notebook), the free scrolling wheel, the switches feedback and very low power consumption (2 months on Eneloop).
Now sadly Logitech has "updated" that model and the latest version is basically a piece of crap (very bad switches and lower quality materials).

Can anyone suggest a similar wireless mouse? Please note that I already discarded roccat and razer because of the very bad battery life.