I've had a few of these planes. I always used flaperons, which move opposite of the elevator. This feature gave me better waterfalls and more pitch authority. I've never used spoilerons couple with the elevator, but I have used spoilerons (both ailerons deflect up) on a switch operating independantly. I used that most often for timed events in funflys, like take off, 3 loops 3 rolls landing. The spoilerons cause the airplane to descend rapidly with the nose high. You balance your descent with elevator and throttle, usually coming in on the power just before touchdown. With a bit of practice you can come in and land really fast.

If you decide to try flaperons, start conservatively, say, 30%. You'll find they actually smooth out elevator response. Interestingly, I've had some ships in which the nose would hunt a bit in harrier, pitching up and down just a bit as if there wasn't enough elevator authority on tap. Flaperons solved this. Lots of folks say you need spoilers to handle wing rock in harrier. I say they need to learn how to harrier. Practice will take care of wing rock. Anyway, there is nothing scary or on the edge about using flaperons. They yield a smooth, enhanced elevator response. If you're a bit nervous to try them, just dial in more expo than normal to start.

Good luck!

Dave