I've helped a lot of guys at our club fly their trainers. The worst trainer is the one that is poorly built, has sloppy controls and warped surfaces. I don't care how good the kit was, if you have to battle with the plane it will impede your progress.

One guy in our club brought a little monster to the field. It simply would not roll right. He refused to even attempt to use the rudder which is the only way to turn it to the right. On top of that he refused to hook up the rudder to aileron channel and just glue the ailerons at neutral.

To make matters worse, he had a brand new Sig Kadet LT ARF that was very nicely built. But he said he didn't want to try to fly it until he learned to land the plane he was currently "flying." Everyone who helped him eventually said they would not help him any more because after 5 months he made no progress with that crappy plane he had because even our best pilots could barely control it. Unfortunately, we don't have anyone in our club who is a safety officer that has the authority to ground an aircraft. That's another issue.

So one day this guy sticks his plane in a tree and can't find it. We're all thinking, "Thank God for that!" Unfortunately he found it and repaired it. The stabilizer now had about 1" of anhedral and a one piece elevator. Obviously there was a little binding going on there. Eventually he started flying at a different club because none of use would help him any more because his plane was dangerous and he refused to listen to the voice of experience.

Bottom line is that it's not just the plane, but the person who built and maintains it.