They're really worth watching, especially for subjects that you don't already know a ton about. C&R has been discussed before and while they're probably not going to be full of new revelations for a serious researcher who has dug into a specific niche for years, they're really good for accessible high level overviews. I know less than nothing about Belgian Nagants or Frommer Stops so it's a pretty good place to start on those kinds of topics. If you're already up to your eyeballs in a specific subject you'll probably find a few errors, but they're also pretty good about correcting things and seem happy to discuss them with people who do know more on a specific subject than they do.