Oh, ok. i just thought it was a cool product because, you know----safety first?
i agree that jackstands should always be used and that they could be used in conjunction with the above product.
Also, yes, you would have to jack the vehicle up at least 15" for it to work and at that point you might as well get a lift of some sort, or better yet, a pit.
But until then, i still feel the product has merit.