in reply to your request, I have a Dahon Roo EL ebike, which I am very pleased with. Could not get it in England ( I live in Spain) so I ordered it from Germany thru' a cycle company here. Not cheap but very well made.
My wife rides a Dahon Speed 6, no motor, just the pedals and 6 derailleur gears, which she enjoys very much. Only problem is, I have to keep waiting for her to catch up!
I am at present lusting after the Birdy/Bionx combo. but cannot find a dealer here to try it out. I am not sure if 18" wheels are the way to go?