I'm not a fan of how the stationary bikes feel when standing, and the emphasis on doing so in the classes. It's nothing like road, and seems to work totally different muscles. Also, since I'm competitive, I don't like the fact that I could be doing the same class with people that are sand-bagging and doing half the work or less. It shouldn't matter, but it totally bothers me if I'm burying myself during a workout and getting just as much 'credit.' Otherwise, the ones with heavy flywheels can be kind of fun for working on cadence, feels a little bit like a fixed gear. I've used them a bit for warming up at the gym. I'd definitely try a class with the Stages bikes though, since they seem to be made more for actual cyclists. I think it'd be kinda cool to own one too, set it up with your fit, and not have to worry about messing with a trainer. Maybe when we have kids I'll look into it, the time savings of being able to just hop on and go may be worth the cost at that point.