I've had mixed experiences with RCBS CS. Had a sizing die replaced at no charge many years ago. But my new Pro-Melt frequently tripped a GFI circuit breaker. They had me send it back and had it about two weeks. They said they plugged it in and it worked fine and finally returned it. No insulation resistance check, nor any comment about use on a GFI breaker. When I got it back, it still tripped the GFI breaker. I got frustrated and drilled out the rivets (which was necessary for disassembly) and opened it up. The wiring inside was a rat's nest. I cleaned up the wiring and put it back together, replacing the rivets with screws. No more GFI breaker tripping.
So I'd say they are good about mechanical things, but are out of their element when it comes to electrical/electronics.
So I'd say they are good about mechanical things, but are out of their element when it comes to electrical/electronics.