Colts are very precision machines. Finding someone to work on them is very difficult-finding someone who knows what they are doing. Smith did exactly the right thing when they introduced the J frame Chief back in 1950, they designed an action that was easy to work on, and would always be able to be fixed by an armorer not necessarily a specially trained smith.
I have a small clutch of Colts and they are really nice, I do carry one every so often, I like the 6 shots being available, and the folks above are right about the Lawman, which came in 2 series the MIII and MKV. I have one of each and they are what I call a "Bogart snub", really big and impressive looking, and they will shoot any .357 round ever made with no problems, and the MK series are easy to fix, which is why Colt introduced them in the first place. Too bad Colt did such a poor marketing job, we might still have a 3rd wheelgun option.