I find the stock parts are just fine. Some might look a bit cheap, but they are functional and they do last. I've had my Brompton near a year and a half and I've been out riding almost every day. No problemo with the parts wearing or breaking.

I do have a few minor complaints about the bike. In regards to the shifter that the op mentioned. The only problem is that it rattles (three speed shifter only) a bit on a rough road surface. Where the cables rub on the frame, they should have placed clear protectors. Lastly - for an expensive bike like the Brompton, they should have provided a better paint finish - metallic or lacquered. I find the paint bland/flat.