First big perk of medium: buying a Freezepop song. I'd only heard of them because of lilinthra but even so I like the group.
At some point I'll get my own copy of the game so I don't only play on kamalloy's equipment. For now I'm going to be cheap though.
If I get good enough at Guitar Hero I may also try out DDR again. I really suck at that game because my rhythm is awful.