I have done a lot of reverse pecdeck. There was a time in the not so distant past that my rear delts were really underdeveloped and weak due to neglect and I used this movement to bring them up.
I have recently transitioned to cable face pulls using a rope. This seems very effective.
I stick with the 15 rep range.
Rear delt work is truly something that needs to have an emphasis put on control and form rather than weight being used, IMO.
"The fastest way to get strong muscles is also the fastest way to make them bigger. We know what works best to make them strong in the shortest time possible. If you want to get big, do the thing that makes them strong." - Marc Rippetoe
Zdravko Veselin Gaeta
I am not a powerlifter nor am I a bodybuilder. I just want to be big and strong.