P3 Strong Arm Reinforcement plates.. Anyone use them?

[happytreefriends]

Saw this on an ad :

Strong Arm reinforcement plates

I guess it strengthens the cracking areas under the motors.
Anyone use them, with or without pop off blade guards?

 

[Matthewd5]

I just got a set the other day, I'm also putting on carbon fiber props so I thought it might help counteract the extra the extra stress that the stiffer blades might cause

Don't know if that's factual, but it seemed like a good idea

Matthew