Sukhoi
There is a guy at the field that flies one of these almost every weekend. He flew it with a Zenoah G23 until last weekend. It did not have very good performance with that engine, but it did fly. Last weekend the airplane had a FPE 2.4 in it and what a difference! It flew with authority, had good verticle--it had much more "presence" in the air.
No thaving flown it myself, I can only say that it seems to fly good. It seems to land at a reasonable speed too. The only thing I have noticed is that the landing gears seems to spread out over time.
-Bob George