I never would have considered carrying the U on my belt…I would get a leather case, like PDAir type, and take it to a tailor and have them sew some sort of belt loop thing.
Lets just say you were using it as a GPS in your car and then u wanted to carry it around later on and may be u didnt wanna carry a bag just for it. Also if i wanted to use it as a MP3 player. Not very portable, but the only real way to use the remote commander !