I've enrolled in several classes through Craftsy... love the classes and their website, which is extremely easy to use. Like someone mentioned above (forgot who!), I only sign up for the classes when they run a sale; I have never paid full-price. It's easy to get yourself on their mailing list so that you receive the special offers when they run. I'm a member of the Quilter's Club of America and get lots of great offers through them also.
For Stitchlady - Yes, the classes are entirely online (you do not get a disc, nor can they be downloaded for offline viewing). They are in "chapters" so you can watch as little or as much as you want at one time. The website remembers where you left off, and it will take you right back there - very nice feature. You can interact with the instructor and other students through a message-board-like setup. There's a place to post pictures of your completed projects also. The Jenny Doan classes are WELL worth the money. She's a pretty awesome teacher!
If you need to know anything else, just post and I'll try to answer.