You can say what you want Saito 100 vs. OS 120 all I can tell you is my SW went from a very poorly powered, fuel guzzling plane to a nicely powered, fuel sipping sweetheart when I changed. Here are my observed specs.

Saito 100

Prop - 15 - 6 APC
RPM's 9200
Fuel for 10 min. flight - 15 ozs.

OS 120

Prop - 15 - 8 APC
RPM 9500
Fuel for 10 min. flight - 10 oz.

9200 on a 15 - 6 vs. 9500 on a 15 - 8 is a HUGE difference in the real world.

The weight didn't matter spit in this plane, actually it helped.

Besides my intention was not to start a Saito vs. OS war ( I fly OS, YS & Saito ) I was just trying to point out that his plane was NOT overpowered.