RE: Prop failures
I have never in my 25 years of flying, never had a failure like that of Master Airscrew prop or any really. And I push my props with over powered engines.
I even fly with a prop that I ground strike and not balance. Just go up again.
BUT............................. I always expect any and all to fail. May never happen, may happen next time out.
Never trust high speed moving parts.
Steve