I have the OS200S version, pulls my EMP/YT fw-190 (15lbs) around the sky with ease, only scale flight of course, no prop hanging lol
but has plenty of power for fast fly bys, loops and so on
only had a few flights. so still a bit tight, but have tacho'd an 18x8 graupner G-sonic at 8,500 so far......would expect a few more rpm after its run in?

cost over here is the same as a saito 180, thats why I bought it, bigger engine, same price.....same power, more torque.
anyway, I am pleased with the way it flys.....so far