I actually DO have one of these...if you are familiar with weight training-it is almost like a leg press machine if you put the heavier bands on it.
I would say that the difference would be like comparing a Weider home gym to a Bowflex-you are doing the same exercises, but one is using stacked weights, and the other is using the resistance bands. With a leg press machine in the gym or on a gym set, you are using stacked weights for resistance, and with the Bun & Thigh Rocker you are using bands.
It does work, if you adhere to a weight training routine for your entire body-that is how I use mine. I also have a standard weight bench for doing chest exercises, etc.
For a totally balanced lower body workout, you still need to do some exercises to isolate other muscles, like doing exercise for your calves. The Rocker isolates mostly your front and back thighs like the leg press.
If you want one, I would totally try to nab one cheap on Ebay-they do work-but in a balanced exercise plan. You can't do like they show on the infomercials-and get fit from head to toe only using that machine.
Start weight after baby #3: 233.9
Current weight: 143
90 pounds lost!