I got into these because I can't stand the mess of cap and ball. All of the crap that gets blown back into the mechanism. You can load black powder cartridge for these too, so it's the same thing.
It's a different mindset. If you are the sort to use speed loaders with a revolver, or run through a cylinder in DA in 3 seconds, this will get old. If you like to take your time and pace your shooting, they are a lot of fun. I don't have a .357, though. 44-40 and 45Colt, along with a 30m1 Blackhawk. I'm looking for a Uberti open top in .38 special, though.