Had one with a saito 100, have another now with the new satio .82
I prefer the .82, plenty of power, better fuel economy(16 minites vs 12 with the 1.00), better throttle management for hover and low speed manuvers. Lightest engine of the bunch.
On 15% CP, turns APC 14 x 4W @ 10,300
started with a os.70 on this same plane. flew fine but not quite enough ummph to climb in a knife edge ( in knife edge the funtana needs a LOT of thrust to climb). performance between the os70 and satio 72 is almost nill unless you use 30% in the satio (the satio72 is lighter than the os though). With the .82 i can gain some altitude in knife edge if need be.
Another advantage to the using the .82 is there is no mount modification needed, bolt on and fly, the .91, 1.00 and the os .70 will require that you elongate the mounting holes in the mount or relocate the the blindnuts in the firewall.

Zonk