A guy at our field has the H9 Sukhoi with a ZDZ 80, flies great, but mounting the engine was fun and needs some work getting full throw from the carb. He needed 1.6lbs of lead in the nose to balance, I would imagine that is because H9 designed the plane around the Zen Twin 80 which has more weight.

I'm going to wait till the H9 Extra pops up online around the $600 range like the Sukhoi has.