I have a Magnum .70 and it has plenty of power, was running a 14X4 prop but just changed to a 13X6 to have just a bit more speed. There are 6 of us at my field with the same plane/similar power plants. We're trying to do some synchronized flying and will see if this lets me keep up with the OS/YS engines.
I'm not that great of a pilot but I can do things with this plane that I can't even think about on others.