I don't have any experience with flaperons on jets, but after trying it on other models i came to the decision that i'll never use flaperons on an expensive model... Although flaperons help to reduce the stall-speed, the flaperons give the model some very odd roll-characterisitcs when aileron is used at low speed, and it might even flip your model over if you fly really slow.

It's ok for very small aileron-inputs, but larger inputs both look odd in the air, and might do some damage when you land with the wheels pointing to the sky.

I do however love spoilerons since these usually are applied on established final or on touchdown, and they're very effective...

Flaperons on the other hand is usually deployed on the downwind-leg, and that still leaves you with two funny looking turns before you land...

My opinion anyway...