To be honest I have never experienced a problem myself, I have heard of the very occasional difficulty with a revolver, and all when down to poor maintance or a worn or damaged cylinder hand (cowboy damage). I once bought an aged M36, fired ok but the ejector rod was bent (caused by a gangster movie mad individual repeatedly tossing the cylinder into the frame whilst pouting with a hand dog look reminisant of Philip Marlowe!), had to straighten it out with a hammer (forging I think they call it, not to alarm the customers). Even though it was a first model it served me well for a number of years.
All joking aside, like all things machanical they need a little looking after, but notwithstanding my view is that the revolver is utterly dependable, a good choice and variety of ammunition, and yes, still has a place as a defensive firearm.