The shape seems like a hack, then. They should have a flat face for the display and controls, and a cylinder for the rest of the body.
It would be more comfortable in a pocket or in the hand, and you could fill the extra volume with a bigger battery or something.
Mo' Shakey, Mo' Money: http://arstechnica.com/gadgets/2014/03/neil-young-endorsed-music-player-kickstarts-past-1-6-million/