733 never had one, but my friends said the plastic parts are very weak. (His upper a-arm broke when he try to start it for the very first time..... And the fuel tank leak) Hope they fix it for later production batch la.
RRR fast and handle quite well. But it is harder to get the setup right as small changes will make a big different in handling.
NT1 very easy to setup but don't corner as fast as RRR. Atleast mine don't.