This is a good product with potential to be better. I find it difficult to position it exactly where I need it. If I use only the straps sewn directly to the cushion, extended to their maximum, they're still too short, positioning the back rest too high for me. If I use the extension strap, shortened as much as possible, the straps sewn to the cushion shortened as much as possible, too, they are still too long and leave the back rest too low. Still, this is a good product, and I do recommend it,...