sleeper sofas are convenient, but not very comfortable, and this product remedies the number one problem with them - the feeling of springs in your back. it's not gonna make your pull-out feel like a cloud, but between the price and the SIGNIFICANT comfort increase, this product is stellar. and as a bonus, it can be folded into the sofa, so you can just put it on and never worry about it again. (to be fair, it's a bit of a tight fit when you fold the bed into the sofa, but it works.) highly recommended.