It is an odd shape actually, and not in a well designed way like many of the Sonys (which did fit nicely in the hand).
I realised that left-handed usage caused the oversize wheel to bind more on the Vibez, so I switched to right, but still the wheel's size was badly picked IMO, well as turning it into a rocker with with a stupid button in the middle of it. I liked the way the Karma and it's controls fell naturally into a right-hander's hold and the Vibez is definitely a step back in that respect.
Anyway, regardless of how problematic the sound quality on this thing is for headphone use, I'm thinking it would make a nice super-mini speaker system with the docking station. Eagerly waiting for it to be in stock...