Ancient thread, but a topic I have been considering recently.
A few years back I started shooting revolvers again due to finding a recent manufacture 637 PC that just has a staggeringly good trigger.
Here it is with a Taurus grip I experimented with. It has S&W rubber boot grips now.
Since then, I've bought at least a half dozen each of new and old S&W revolvers. Some of the old ones have amazing triggers, some of them are only ok; the same can be said for the new guns. I had a recent manufacture 625 PC that had an
amazing trigger, and I had a recent manufacture 686 PC that had the wrong strain screw and had a horrible trigger until I figured it out. My pre-37 trigger is kinda rough and heavy, my pre-36 trigger is like warm butter.
The biggest problem I have dealt with is light strikes from new guns. Even with stock springs, I have had a couple of new guns with internal firing pins that would fail to ignite. I had a 325 that wouldn't ignite reliably even with stock springs and a Apex extended firing pin (a slightly longer Cylinder and Slide pin fixed it after much frustration). I'm at the point where I just replace the firing pin with a C&S before I even test it.
So, I have started to gravitate toward pre-internal firing pin guns. The lock has never been an issue for me.