I have one of these with TT.60 2 stroke for power. I love it. I have the CG set behind the manual limits so it has neutral stability. It does the most insane negative snaps I have seen. My build is standard but be careful with the rudder linkage. I had rudder flutter on my first few flights till I changed the linkage to a ball joint. Apart from that I give mine a real thrashing and it comes back for more.