I think it really depends on what you want to get out of it. There's content that is just a treat and fun to watch, but the idea of it being a "class" is rather disingenuous. Like, are you really going to become a composer after watching 6 hours of content? Or a rock climber?

But the stuff that is set up where you can have a chance at succeeding by practicing what you are seeing really does work. I was gifted a subscription and because of it watched the Thomas Keller series of cooking. I had never cooked before, but I have tried just about every recipe of the series a few times over, and no joke I've been able to produce truly REALLY fine dining experiences at home. Those lessons, for instance, are super didactic, build cooking up from first principles, show you all the steps, etc. It is fascinating content.

And then, for instance, watching some of the other stuff, like rock climbing, for example, can also just be fun. So, all in all, I think depending on what your profile is and what your expectations of it are it can actually be worth it.

If Masterclass were scummy with their cancellation policy, OP would not be able to see for themselves. A frictionless policy allows people to experiment with services. My wife and I subscribe to one streaming service at a time because of that.