these Xootrs really intrigue me.
Xootr Swift Folding Bicycle | Xootr Urban Transport

I'm going to see if I can try one out here in NYC at one of these dealers:
Where To Buy | Xootr Urban Transport

The geometry looks like it would be sturdier for a tall person. I'm 6'2".
And it gets very positive reviews from owners:
Amazon.com: Customer Reviews: Xootr Swift Folding Bicycle - Blue

Seems like a nice folder for someone like me who lives in a tiny studio apartment. But it doesn't fold as small as most others, which would make it a drag to take on crowded subway cars.