I mean in that trimming was so far, that I had to adjust throws on the push rods some. I never had to mess with the servos, but in particular, the pitch had to be tweaked on the ground. First flight, the thing lifted off like a rocket going for the moon!! Wasn't sure I actually had enough throw on the down pitch to bring it back to earth. It really caught me off guard. Also, it really liked to bank left. Now, I have to admit, I balanced it quickly, and on the fly. A little nose heavy, but not bad on the bench. I could have, should have been a little more thorough, and am probably lucky that I landed it the first flight upright. It's a good rtf plane, and a fun one, but mine, liked to go up and left like a rocket on the initial flights.