We're really liking it. I didn't really consider myself as someone who would like stereotypical spin classes - but they have a good variety of trainers, types of classes and music. Overall its been really nice, its expensive - but basically replaces gym/workout class membership (my wife used to do Pure Barre).
Edit- should add they have a bunch of exercises to do off the bike, so more than just cycling. I suspect as the market sees more competition from Apple and others, they will have more and more features.