RPM carriers are pricey, but worth the $ if for nothing else but the fact they run larger bearings that last a lot longer than stock.
I suggest that if you do run RPM that you don't run the shocks in such a way to be at maximum extension. The RPM carriers will allow the ball to pop through when they are put at an extreme angle and you come down on a side loaded landing with the arms hanging at full extension. I had that issue on my revo, so I ran the arms so they sat closer to parallel to the ground at full extension then never had one pop off again.
