Thanks for this thread. Like the OP, I've been looking at folders (though not Bromptons) with some doubts about their convenience.

What do you do with a folder while you're grocery shopping? Put it in your shopping cart? Carry it with one hand and push the cart with the other? If you have to use the restroom, do you take the bike in with you along with your backpack? Seems like a lot to juggle. And couldn't a folder get swiped just as readily from under a desk or restaurant table as from a bike rack outside?

I'm just trying see all angles before taking the plunge. I do like the folder concept. FYI, I'm looking at the Dahon Speed Uno.