I ordered a Model 19 Carry Comp from Buds. It had a beautiful trigger. But ... you had to literally smack the right side of the cylinder to get it to open, it didn't lock up properly through an entire 6 round dry fire cycle, and was so pressed against the frame that the finish was scratched through to the bare metal in two places. I was appalled that it got out of the PC that way. No choice but to send it back. A few weeks later, I bought a PC 686+, and it was perfect. QC is dead at S&W. Buy at a gun shop. Check it out rather than buy sight unseen. If you get a good one, it's an awesome revolver. My personal experience over the past five or so years with internet-ordered S&W revolvers: 6 ordered, 4 of which were from the PC. Model 66 was good, Model 586 returned, I declined to try a replacement. Of the PC models, TRR8 was good, kept it. 686+ 5" perfect, will keep for life. 686+ Snub kept but returned to S&W to correct clocked barrel and poor finish. Model 19 Carry Comp, disaster as described above. 3 out 6 ordered -- a full 50% -- were defective, and that average applied to the PC, as well.
I'm not bashing, I love them, and I've bought enough of them. But, I feel I've paid for the right to gripe about their lack of QC.
As far as the lock goes, I don't care for them, but I've never personally had a mechanical problem caused by them. With a few exceptions, you want a new one, you deal with the Lock hole.
The finish on the new Model 19 Classic is much better than that on the Carry Comp. The Classic has a polished blue finish. Not by any stretch of the imagination comparable to the blued S&W finishes of decades past, but attractive and acceptable. The carry comp has a pretty fragile and unattractive finish that reminds me more of Parkerizing than bluing. If you're over 50 haven't seen that type of "bluing" before, you're going to be very disappointed. The 586 Classic has the same type of finish.
I apologize that a good part of my post is somewhat off topic.
Edit: Geesh, I forgot that I had to send the 66 back to correct a canted barrel, lol. The percentage therefore is greater than 50% defective (from my personal experience, of course).