So far I've found chondas that have no faults, run just about as well as Hondas, though they usually sound worse because of different mufflers. So, you got the result you should insist on getting with chondas, Jaffa. Nothing wrong with them that isn't due to corner-cutting in the purchasing department. I don't yet know if their piston rings last as well as Honda ones.
I'll close this thread.