Good info above, but if I were to get a 16"/349, it would have to be a trifold, for folded size; The only reason I would buy it would be ease of flying with it, either checked baggage, or even carryon if disguised, as some have done. For local or train trip, my 20" bifold goes in a trunk or luggage space just fine, and it's way better racked and panniered than I could do on a Brompnot, both size, and it would impede the fold.
A friend of mine just informed me he is in Vietnam, been there two weeks, and there another two weeks. He's not a big biker, but I gave him a brief rundown on the general Brompton philosophy, and mentioned that asia has much cheaper copies, and he wouldn't need to pay $300 shipping as I have seen. I don't think he has the need, he doesn't do multimodal commuting. But if there is a particular 6 speed model that is sold there (I don't think the Dahon Curl D9 is available yet), that is a great deal, please let me know, thanks.