I'm a stubs card holder and its worth it if you go to the movies a lot! You get a free $10 for every $100 you spend on tickets / snacks... Also you get free upgrades at the concession stand. That means when I buy a large popcorn or drink, I pay the price for a medium one instead. My family spent over $1,000 at AMC in 2013. That membership REALLY came in handy!
I can't get into it but my mom is a big fan so at least I know what its about. My mom thinks that its so amazing that JK Rowling made all this up but for me, all the magic and spell doesn't seem like anything out of the ordinary, its what you'd expect from a book about magic and going to school..