Originally Posted by MartinOne

I have very little confidence that my "rating" of fit to body height can be separated from all sorts of other factors. For that matter, no single factor seems so important that it ought to toss out all the other variables that matter.

Trying to isolate body-height fit from the other factors is next to impossible even with a reasonable (say, one hour each) test ride of each bike considered. Bikes simply feel different after owning them for a while, and it's most likely that your preference will shift to favor they bike you bought.

My ratings (these differences are all slight):
Solid, responsive, robust ride: Birdy and BF Ticket (largest of 3 frame choices); next, Brompton; next, Dahon
Tall-person ride: Birdy; next, BF Ticket; next, Dahon; next, Brompton.
Longer, unhurried, flat ride: Birdy; next, Dahon; next Brompton; next BF Ticket.
Foldability, storage, convenience: Brompton---nothing else close.