Comment by jeroenhd

It'll scroll (well, perform a swipe action, which usually translates into a scroll, except the wrong way around), but it's not the physical knob normal mice have.

I also find the scroll response rather unpredictable. I usually love touch gestures, I'm even considering getting one of those Apple touchpads for my Linux machine, but the scroll area on the tiny curved mouse surface isn't intuitive to me.