I have a Flair Edge 540. I weighed the ailerons due to them feeling odd. One weighed 67gms, the other 132gms. It felt like a cricket bat. They did replace it but you would have hoped someone would look at this before the poor old customer finds it. Would have to fly knife edge all the time if I had fitted the original heavy aileron with 9kg servos to drive it. I have had to add triangular balsa everywhere though to the joints as the butt joints are poor all over it.