I too, have some reservations about Dahons for longterm reliability. I think they are very good bikes for the purpose for which they were designed, that is foldable and ridden in an average way, but I wonder about heavy-duty use. But there are users who use them like that also. Steveroot over in the Dahon forums, for example, has commuted daily for years on his 2 Dahons. But he does check them very regularly for wear and adjustment, and he has had major failures like once his frame cracked up at the seat tube.