The main problem I have with spoilerons of flaperons is that they make the elevator less effective during the most important time.. during landing. Just figure that adding, say 15 degrees of flaps to the flaperons during landing will reduce the aileron effectiveness by 15 degrees. I'm sure that there are many opinions about this, but i've seen this in action and just avoid it. But, again, I am not a super advanced flyer, and I like things simple.

CGr.