One thing I noticed is that I can't get the Bipe to harrier too well in AFP. It just won't stall, and when it does it drops too fast. It's hard to find a throttle setting that will keep it in a stable harrier. I'm not complaining though, I really like the plane. I just wondered if it's me or it's the plane. Another thing is that it does great upright flat spins but I can't do inverted that well. I've been spending a lot of time flying this one.