Not sure if you will be better suited with Dahon (overall, not regarding braking frames). Those kind of things happen and have always happened to a degree. Just today we recognize them more easily as there are internet forums. And problems are more prominent than positive experiences there. Nobody posts "I own a Tern and my frame didn't brake!" In fact we do not know how many frames were produced and how many broke. All we know is that some Tern frames broke and that's not too much knowledge overall. The two relevant questions are how big the risk is and weather we are facing a ford-pinto-scenario. I can answer neither of the two.