There is no bad props, just bad applications. Would I use a $9 Dynathrust or MA prop on a precision 3D scale aerobat? Of course not. Then again, neither would I use a $150 hollow-core carbon prop on a beat-up ol' Sunday flyer running on a chainsaw engine.

I've used both Dynathrust and MA Classic props on my giant scale sport flyers, where I don't care to wring the last Oz. of thrust out of the engine. Putt-putting around the sky with super-efficient high-dollar Euro blades at 1/4 throttle is just plain silly.