I don't trust ARFs ... and no I'm not trying to start that discussion again.

I've had two ARFs, a Raptor and a Nexus. I tore them both down and rebuilt them ... missing threadlock etc.... both had similar building flaws, in fact I'm sure both would have thrown a paddle had I not checked.... an ounce of prevention.

ARF helis do give you a headstart in giving you a better idea of how it should go together... but I strongly encourage you to check everything.