I just got back from the Mayhen maiden flights. Very stable, but it does need bigger rudder. The motor bogged down too much with the 18x6w even after I cut it down to 17. I borrowed a 16x4w from a friend and she came alive. Very easy to hover with very little rudder inputs, but it feels like it could use a bigger rudder for more control. Harriers are totally stationary with 15mph winds and you can just about land it on a dime. Some of the maneuvers like flat spins are hard to do due to the large wing area...other than that it's great.