I recently had my two colt's Dragoons worked on.
I originally wanted to do the work myself but after a lot of research and looking for info on how to properly fit the conversions so I could still use the original BP cylinders, I decided to pony up and have the smith that Kirst recommends do the work.
I believe it was money well spent and I'm glad I went this way.
Now, I shoot in at least three Cowboy Action Matches a month so I shoot a lot. But if you are just a pinker with low volume of rounds fired a month, I'd say look at it very hard to see if the considerable cost plus shipping plus insurance both ways is worth it for you.
I had two guns done and I'm happy with the results.