I'd say I've probably seen 1/100th the number of revolver malfunctions on a per-round-count basis that I've seen with autos. That's just a guess, but it's and order of magnitude different. And I've never had any revolver I owned malfunction in a way that would preclude continuing to shoot it in an emergency (that is, ignition failure doesn't mean you have to clear a jam). The only revolver failures I've experienced are a hard/bad primer that didn't ignite in a S&W 586, several .22 rounds that didn't ignite in a S&W K22, and a rear sight that worked lose on a S&W 29. I've seen so many things go wrong in autos I'd hit the post size limit and still have forgotten lots. That said, I carry an auto. They're reliable enough. Just not nearly as reliable. I also don't carry a backup. I figure there's lots of other things I could carry with that weight that I'm more likely to need than a 2nd gun.