I have a Brompton. The fold is great, but now i’ve used it a bit, i’m discovering the reliability isn’t that so good. It seems to require a disproportionate amount of servicing.
The latest thing is the headset seems to have gone notchy and worn out. There’s a lot of leverage on it, but not many ball bearings in there (they are caged).
The cables also seem to need a fair bit of maintenance, especially the front brake cable, which forms a U-shaped loop so it gets water trapped in there.
The gears are also wearing out much quicker than I expected (I guess because its only a 13t sprocket or something).
The pedals were also useless, so they’ve been changed for some Wellgo QRD ones from eBay.
If you need it to fold small, its the best thing to get, if not, i’d look at Tern’s/Dahon’s/Mezzo’s etc..