Frankly speaking, the whole lock issue is overblown. By any real-world accounting, lock failures are extremely rare and seem to happen most often in smaller guns firing hot ammo. If it was a real, as opposed to emotional (or political), issue, I have a feeling S&W would have made some changes by now.
Incidentally, the internal lock was added after the Clintons left office and after the sale of Smith & Wesson to Saf-T-Hammer. Curiously, Saf-T-Hammer renounced the agreement Tompkins PLC had made with the Clinton Administration, to avoid being sued into oblivion, but implemented the interlock program anyway. Perhaps this is because gun locks were Saf-T-Hammer's business before it bought S&W?
I had the opportunity to choose between a Smith & Wesson Model 60-15 and a Ruger SP101. The S&W was more expensive, but I chose it because it felt better and had a far superior trigger pull. I also have a Model 637, which I think is one of the best bargains in a modern CCW weapon, as my "New York" reload. The only change I have made to either gun is the addition of the wood grips from the Model 60 Pro. I have put thousands of rounds downrange with these two guns and have yet to encounter a problem. This includes a fair number of factory +P and Magnum rounds, though, to be honest, I would prefer a heavier revolver for the Magnum loads.
I got my first Smith & Wesson, a Model 15 Combat Masterpiece, in 1970, five years after the Wesson family sold the company to Bangor Punta. Over the years, I have owned a large number of Smith & Wesson revolvers and pistols. IMHO, a lot of the bellyaching is pure hooey: today's Smith & Wessons are certainly better than what the factory was producing in the later Bangor Punta years and throughout the Lear Siegler era.
So, FWIW, I give a big "Hey!" to Smith & Wesson.