the primer feeder on the forster is a pain, stick to the RCBS, the filler tube holds more primers and is less then a pain to refill.
Changing from case to case on the rcbs is as simple as changing your shell holder, the coax has a universal claw that you have to fiddle with and set with screws, not such a easy change.
I modified my RCBS with a key ring and a spring from a lawn chair, drilled a hole in the arm, tapped it and inserted a machine screw to hold the spring, now the handle come back up all by itself rather then having to lift it all the time.