A Moulton holds the world speed record (51mph/82 kph) for a bike ridden in the conventional upright position. although, it didn't really fold. The classic 'folders' and mini-velos - especially Moultons are in huge demand, we had a guy come over from San Francicso to pick one up. Vintage Dahons - well - 20 years old or so are snapped up on Ebay. For some, taking the wheels off to get a bike on the subway, isn't always fun (ny).
The adage now is that there are very few bad folders, but a lot of bad large wheel bikes.

In twenty years time our kids might be hollerin' for classic bike Fridays.