When doing a simple search on it, I found a lot of ebay listings/craigslist listings from people who used it once and are selling it. It looks like it works if you want to do some strengthening as well as flexibility exercises but it may not be for everyone. It looks like some gyms offer classes using it and others compared it to the Bar Method tapes which use a heavy chair for some of their exercises.
If I was looking into buy it, I'd try to find a local gym that offers classes and see if I could at least try it out before buying it or rent one of the DVDs that are similar such as The Bar Method/Lotte Berk and see if those were for me.
If you do end up getting it, let us know what you think of it.
You can't out-exercise poor eating habits.