TBH, I saw the informercial and wasn't impressed. While it may be good for crunches, I really think that the best way to flatten your stomach is to do Pilates - and as a bonus, you support and strengthen your back, which is whic Pilates is betterm its' not just aesthetics, it's functional.
For 50 dollars you can get several good Pilates workouts to include in your exercise rotation.
JMHO