The only thing you run into using a false name is that if your source fails to pick up the money or you made a mistake filling out the form you won't be able to get the money back or change the address.
True. Ive never ran into one of those problems before though. Personally id rather risk losing the $300 or whatever it is on my cycle, than to use my real name to buy the stuff with and give the DEA a paper trail.