I have both the Saito-91 and a YS-63 (old version). And the YS will spin the same prop (12X8) only 200 RPM slower. So the YS-110 will be heads and tails above the Saito. Another advantage of the YS is since the fuel tank pressure is around 8psi (use seamless tanks), you can put the tank over the CG point on the plane and it's flight characteristics will not change with the consumption of fuel. Now with that said, if you have not owned a YS be careful, they tune differently than a standard nitro motor. The high speed is the same for rich/lean, but the low speed is an air-bleed setup. So CCW is lean and CW on the LS is richer. You also have a diaphragm pressure setting that can affect the overall operation. Takes a little getting used to, but in my opinion and many others, once you go YS, you don't go back. Unless your wallet says otherwise.
Mike