Congrats on the PBR, sounds promising!
So I took my river jet for a punishing upstream bash in a very shallow creek:
Broke off one impeller blade, the other two are partially broken off as well. The thing sitting further down on the shaft is a brace/buffer for the stuffing tube. This also broke off.
So I need a new impeller, maybe a new entire jet pump housing if that brace really needs to be attached to the housing. Ouch.