This thing is the bee's knees ^_^
Super smooth, easy as to assign macros, the 2 scroll wheels are awesome – I have side one set to scroll between tabs when browsing the internet – is very handy and speeds up my work :D
That cool textured bit for your thumb is actually a button too! press it in and you can assign a macro, press it and move it a certain way and it will do something else. I have it set to my media controls – very handy.
Very ergonomic, high quality build. The ability to sync to multiple computers and then have different profiles for each one is very hand (work/home use)
I am mainly using this for work and then slaying noobs at home with my Logitech G302 MOBA mouse (highly recommended too!)
You won't regret this mouse :D