I've done a bit of Tae Bo at school and personally, I think it's stupid. Then again, that's because I'd rather do other aerobic workouts - if this works for you, as long as it gets you moving, that's fine. Although it has some "martial arts" thrown in, don't expect Tae Bo to help you out much if you happen to get in a fight.
Conclusion? It's not for me, but if you guys like it, stick to it!