the frist problem I had with the roto start was rite out of the box put a batt in it and pressed the botton and it sounded terrible, grinding. I took it apart there was no grease bone dry put some in and dang 12 screws or so later and it was much better. I've had my share of other problems but with new eletronics and servo and some linkage changes it was running really, really good last night seems like a good truck just no quality control at the factory someone said it good in here somewhere that they are being put together in china with almost slave labor so what can be expected. If you paid me in rice I wouldn't care either. So far I thick it's wickedly fast, lauches, flys, and land's well. I think with better tire's it'll corner better it was doin OK last night but could be better for me anyway. well that's my $0.02