Did S&W have a really bad run when they made the 640 Pro? (The fluted barrel ones)

The reason I ask, is because almost every single forum I am on has people posting about broken trigger or hammer pins, or other various threads complaining about them. One thread even had a chip out of the frame.

I like them, I really like that they don't have a lock. I'm thinking of upgrading to one for my EDC but some of the mods I am planning are permanent and expensive, I don't want to invest that money into a gun that comes from a bad production run.

Currently I am running a 649 but I want to refinish it black, and given the cost of refinishing, part of me wants a no lock gun before I drop that kind of cash.

I don't mind having over 1k into a carry gun, but like I said, it would be nice to drop the lock AND get night sights plus the other features of the 640Pro.

In the end, I can live with the lock if I have to, and my 649 has treated me well, but some of the 640's features are nice.