Thanks for replying everyone.
I'm going to get a new folding bike soon (my Montague can't be repaired). Gobike sounded great. Far less expensive than a Birdy, but, like Dynocoaster pointed out, very similar. The gobike even had disc brakes. With birdy you have to pay more for the models with disc brakes. I guess if something sounds too good to be true, it probably is.

Hopefully, I'll have a chance to test ride a bike friday and a brompton before I make a final descision, but my parents are going to Germany on business and are willing to bring back one of the German models of the Birdy (more selection over there). I'd probably have to pay them back.