I am the right person for this. I am from China but now lives in UK. First, folder market is boiling in China, the reason? Astonishing theft rate means any sensible people won't leave their bikes outside. At the same time insane flat/house prices means most people live in a small flat (2 bed rooms normally), which offers little space for regular bikes. So not just Fnhon there are couple of brands making Dahon like folders, e.g. LANGTU, OYAMA (from taiwan), JAVA, a couple of more (can't think of). Fnhon produces parts (frames, handle posts, seat posts) as well whole bike (Fsir, which is not a Dahon clone, instead it has some really cool design). A lot of people just buy the frames and buy other high end parts and assemble their dream bikes.

There is another brand needs to be mentioned and some people may know here, Litepro. Yes this is another Chinese company which produces (outsourced to Taiwan factories as I know) high quality parts, which used to be only available at insane prices. For example, Litepro V238 v brakes at only 170 g for about 18.5 pounds,
https://item.taobao.com/item.htm?spm...id=41902578885

The quality? I have a fnhon frame (similar to the one used on speed pro/tt) folder with lot of litepro components, I used that for commuting by train. It's been a year and I don't have any complaint. I have a Dahon MU SL got on ebay so did some comparison. Build quality is similar (frame), while the main hinge on the Dahon one develops a issue (tends to get loose) over time. This could be a defect (ebay product) or the Aluminium frame issue (not sure), Fahon one is 4130 steel with alu fork.

Of course the name Fnhon is really not cool. And real barrier is language. You will have to use Taobao to discover those stuff. BTW, this guy did some amazing work using the parts from taobao.
Hands On Bike: Dahon MuEX