O.K. Here's my take on Smith & Wesson revolvers:
I own maybe a dozen of so Smiths, .38 Specials, .357 Magnums, .45 Colts, and .44 Magnums. So, my experiences.
I have an early Model 29, 6" barrel, bought from a friend with maybe 1,000 rounds fired. I experienced some parts breakage, notably the trigger pivot pin. This using factory and heavy handloads. Also had the cylinder unlock when firing, and the hammer deliver a double strike on the primer. I complained to Smith about this and was told my gun needed the "endurance package" installed. I returned the gun to Smith and this was done free of charge. At the same time I had a full lug barrel installed, getting an 8 3/8" barrel. Shortly afterward I had my gunsmith cut the barrel to 6". No further problems, and having fired in excess of 10,000 round through the gun.
A second Model 29 I had fitted with 5" full lug barrel. This barrel turned in the frame, so I had my gunsmith pin the barrel. After about 8,000 rounds the barrel stub split. Smith replaced the barrel with a new one.
These two .44 Magnum revolvers are the only ones I've had break down, and for a DA revolver, Smith wins hands down with me.
In addition, I might add, I've had Colts and Rugers experience similar break down. Most of my guns have seen heavy use, most have in excess of 10,000 rounds fired, one Ruger .45 Colt Blackhawk nearing 20,000 rounds. And, yes, I keep a count of rounds fired in my log books.
Bob Wright