I'll barely if at all touch my old box even if it does have XBMC or Emulators, I rarely open them up anymore anyways, because I sure am lovin my 360 along with the games i got with it, they all look pretty dang good for launch titles and a few of them surprised me
The xbox live features are awesome also, the achievment scoring is kick ass, and the market place shows promise, and so does the media section, the skinning options for the dash are ok, nothing spectacular but with an update hopefully it will get even better
And playing my own music from a playlist on my ipod during any game...it's just great!