OS is the champ of reliability and consistent quality control. I have the OS 32 and I love it. However, if pure power is your concern, other engines like YS shine. I don't know if YS makes a .30. YS is harder to set up and more tempermental, but makes gobs of power. If you are new and definately plan to get a .30 size heli, I would go OS. By the time you get into high performace stuff, you'll be ready for a bigger heli or upgrading to a .50 engine, and you can choose whether to experiement with the higher output, fussy motors then.