I run an OS .46 with an APC 12x4. Haven't tried real serious 3D much, it is mostly for club fun flies, and there I pretty much win every event. With that prop, it has great vertical acceleration and slows down fast (like for looping touch-and-gos). Not a high top speed, though. But good enough to win high speed vs low speed events where the plane with the widest envelope wins..
Mines getting pretty worn - cracked canopy held together with clear gorilla tape.....