At the risk of sounding like an idiot.........

On various forums, I have read about the dislike of the internal locks on S&W revolvers. I'm just curious about issues with these. Are there mechanical problems with those?

I only own S&W PC revolvers and haven't noticed any problems, but I'm not the most dedicated revolver shooter.

I posted the question here as opposed to other forums because of the collective actual experience here and the practical answers. I grow weary of the typical "Well you can do it cheaper......." answer.