I know a lot of people who swear by them as some miracle product. I have one and I like it. I do think it provides a little extra cushioning without adding bulk. However, I don't think it's the miracle they claim it to be. Perhaps it's because I don't have back problems and neither do my horses so I can't really be a big judge of that. But I can say that ThinLine is a fantastic company to order from. And the 10 year full warrenty was enough of a motivation to go ahead and get one. I got mine from ebay
off some person and accidently got too big of a size. The ThinLine company allowed me to return it to them directly and exchanged my size. AND paid for shipping. That was pretty cool.