While I have been out of a trainner for quite a while I have seen many of these planes fly. They are what they are intended to be a trainner. I havent seen any bad tendencies with them but then again any trainner that has bad tendencies most likley wanst put together correctly and has nothing to do with the quality of the ARF. As far as build goes sorry I cannot help but like I said I have never heard of anything bad. Good luck should be fun.