From everything I've read on the Katana, there were problems with some of the first sold, maybe the first few hundred? Hard to say, I'm not even sure what to look for on the wings to know if I'll have a problem or not.
hell im going to be plenty nervous as it is when I maiden this bird, I'm going to take my time building it, making sure it's perfect, I'm running some of Hitecs best servos, as well as a super expensive JR reciever, haven't decided on a receiver battery yet but I will probably keep it simple and use a 6v nimh pack.