I have Carillo's DVD and I do it once a week followed by a section of Stretch Max. The "workout" is okay but the guy is a little bit boring in it. He's a triathlete not a yogi and every single time I do this DVD I think that Cathe can do a much better job if she ever decides to try out a yoga workout.
By the way there's nothing like a live yoga class. I don't have a studio nearby anymore so I try to practice at home but it's not the same. I've done Hatha, Bikram, Vinyasa, and Ashtanga before Iron Yoga and there are differences. I'd say that Iron Yoga is more strength oriented than flexibility oriented if you compare it with traditional yoga, of course you will always have to work on your flexibility, but it is not its main goal. My perfect yoga class would involve light weights as in iron yoga, but with super tough poses to work more on my flexibility. I haven't seen anything like that yet.