PS and RES are similar in niche environment. PS are known to stunt (possible) as do YP and RES are not known to stunt. What size fish will be delivered ? I would want to be sure of my source of predator fish before I stocked YP and PS.
Eric the main problem about RES for most of us are the darn things are almost impossible to catch! I have decent luck in a pond where they are the only fish. Put them in with a bunch of hungry BG, and catches are far and few in between.
Of course that could be because I an not a very good angler and severely lack patience!