I got my motor for only $30ish. Whoever is paying $50 is getting ripped off. Dyno tuned ones are around $40ish. The only thing I'm wondering... and I'd have to go back and reread the rules... but the Reedy Quad's armature shaft does not extend past the bushing/bearing with a "step" machined in it. Kinda like a C2. So that would be my only concern with the Reedy motor.