I only spent a few days trying out a Brompton. I found it infernally hard to lift the front two trolley wheels and pivot when I wanted to change direction. Also the darn wheels kept getting wedged in between floor tiles. I own a Flamingo NX7. Much the same system as Brompton, and also equally difficult.

I dunno, perhaps there's a trick to it. It just felt much more inferior coming from the Oyama. It was also a bit of a surprise since I expected that a bike so famous and expensive to have superior folding mobility.