Not sure of doubts about Chinese motorbikes have been laid to rest, but last year read up on the Fantic Caballero 500 scrambler/rally and a few people mentioned that nobody needed to worry about the 450 Zonsheng engine fitted which is said to be a good reliable piece of kit. OTOH one hears stories about cheap Chinese commuter and learner bikes with poor quality fasteners corroded even before delivery. Seems to be a mixed picture . . .