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If you own a modern Rolex and arnt too concerned about originality of parts or polishing I think an RSC is a safe bet, I think you could save a few bucks on a normal disassembly/clean/relube service with a quality independant. Just like specialty cars or anything else really.

If you have something old and/or collectible and you want it to stay looking old and collectible I think a bit more research is warranted and you can come to your own conclusions on what you value. I would never allow any polishing or switching out of a scrached up bezel insert on 50+ year old GMT for example but I guess that makes me a wierdo. 80s two tone datejust, make er look new and enjoy as a new watch.