I have a lot of Tae Bo DVDs. I don't think they are dangerous, especially if you've had kickboxing training previously, or you start with the instructional and beginner workouts. Form really is everything, as is true for all exercise programs.
I have both his previous Bootcamp set, and the new Elite Bootcamp set. I like some of the workouts in both, dislike others. The Tae Bo workouts that I consistently enjoy are the Cardio Circuit series, and the Fat Blaster series. Collage video has them both. But if you want serious cardio, 'old school' style Tae Bo, try the Get Ripped Advance workouts.
I did Tae Bo workouts for 9 months, and got kind of burnt out on them. Then I discovered Cathe's workouts and I'm in love! I've bought so many in the last month that it probably would have been cheaper to buy a DVD bundle, LOL! I can't wait until I move back to the States (I'm in the UK now) and can order a High Step and start those workouts, too.
Cheers!
Stephanie