I have used flaps for many years and I am a big fan of using them.

With the recent trend of using two aileron servos, I was seduced into trying flapperons on two of my planes - never again.

I didn't find any less aileron FUNCTION per se, but both planes acted a bit squirrley on landing approaches, especially during the turn-to-final. In fact, I lost one of the planes when the inside wing stalled on the final turn - and I've NEVER stalled an inside wing - before or since.

I immediately stopped using them on the other plane and won't use them anymore. However, I WILL continue to use regular flaps!