Nobody seems to be jumping up saying yes, so I'll yammer on until they do.
Those programs basically are a personal trainer on a DVD. There's nothing magical about them. They haven't discovered a secret way to get fit. They're just a new way to get fit using an impersonal personal trainer.
The people that get fit using them and that endorse them, with newly muscular bodies, would have the same bodies if they had hired a personal trainer and put the same intensity into the personal trainer workouts.
The key is intensity. If you have time every day to work out and the DVD's work for you, go for it. If you have the same amount of time, but need a more personal approach, hire a personal trainer at a gym, and you'll get the same results.
Most people order the DVD's, watch them while eating a bag of Nochos, and then are disappointed that they don't look like the cute hispanic guy on the stairs.