I took my rb out yesterday, first time for a long while but it flew really well, no vices and looked well in the air. I fly off grass so do need lots of up elevator for taxiing and initial part of takeoff. Btw mine is built to the specs in the manual, os91fx, and no other major mods, mechanical retracts etc. I needed only about 3oz of lead in the nose to get cg right. I have to say I am very happy with it and it's still going strong several years on.