Quote edited for accuracy.

P.S. I consider properly trimming a model to be a never-ending proposition. Plus, there's always something that gets a little out of whack just by flying it for a while.

I remember a student that became amazed when I did a nice crisp (fairly-slow) perfectly axial roll with his trainer. He was getting cocky, so I had to remind him that while he was doing well, he shouldn't stop learning or start being content with mediocrity. Should've seen his face!

Trainers will do it too, they just take a little more coaxing.