The design is superb, usually many people buy sofas just because of the invention. I think it's wrong. It happens that the couch is not used for sleeping at all. You, your relatives and friends will only sit on it, watch TV, read books, talk. Then you can buy furniture with a "book" type mechanism or another. When unfolding such a model, a not very smooth surface is formed, so it is desirable to supplement it with a mattress. But if you sit on such a sofa, everything is fine, everyone is comfortable, and beds are not required. For example, I buy furniture exclusively at https://www.gardenfurniture.co.uk because of the quality. And then somehow I ordered a sofa and a month later it crumbled.