Downs Exercise Disc???

Okay, at Steal1 today, they have the Downs Exercise Disc and pump for $4.99 with free shipping. Now, I am not sure how I feel about it yet...I watched the video, I can see where using it under my lower back while exercising could definitely help with the pain that comes from having 2 epidurals in 2 years (thanks kids, lol) , but not really positive that I want to invest $4.99 to try it..... I'm gonna think about it for a bit.