Video quality is pretty good here, unlike Youtube which can be hit or miss. There are also several multi part treatments of various subjects. At least 2 good breakdowns of the French defense by GMs for instance, both 6 or 8 lessons long. Still, videos aren't my main reason for premium, it's the ChessMentor or "Lessons" as they are now known. At my age I may not be learning much but I find doing them quite entertaining. Most of the authors really make an effort to anticipate common wrong answers and have pretty good explanations ready for what's what. I think the most practically useful courses are the ones specializing in each tactical motif. Sure, forks and pins, but how about interference? Silman has a very large and difficult course on middle game decisions. Anyway that's my take on it. Here's a link to the free Chess Mentor courses. See if they whet your appetite for more....
https://www.chess.com/blog/webmaster/free-chess-mentor-courses
I have been playing chess seriously for a few years now on other sites and recently started at my first chess club, I just made this new account on chess.com today, and I am serious about long term improvement of my game. I'm considering going for the 1 year Premium membership here but there are some things I need to know about the resources on this site first before I go through with it. The chess mentor, videos, lessons here I have no point of reference with so I don't know how to value their effectiveness. Basically I just don't know that much about these areas or many of the other resources that you get with premium membership. Are there resources like videos on pretty much any opening I would like to play, Master games in basically any opening for me to look through. I just don't really know exactly what is on offer which is why I am on the fence about paying the £75.00 for the 1 year premium membership. If anyone can give me a breakdown of the things I get with premium membership and actually explain in plain English what the experience with each resource is like I would really appreciate that, as I will be able to make this decision much more easily. Thanks