I've bought only one ARF during my whole modelling experience (once felt the urge to have something to fly).
As Gordon Mc piointed it out, it is a real pain in the ass to have to redesign a badly manufactured part of your ARF.
This is really what happend to me with this ****ty ARF : hinging hadn't been propoerly done , so that throws were not big enough, especially for the rudder. How the hell will I knife edge with this BS ? I asked myself... I 've been obliged to "unhinge", and believe me, it was awful[:'(][:@][sm=angry.gif][sm=punching.gif][sm=thumbdown.gif][sm=disappointed.gif] . Don't think I'll renew the experience.
Today, I really tend to regret the aircraft kits, which have now largely been replaced by ARFs

. "A boon for the flyers, a bane for the builders."