I used to have sofa beds, but a) the "works" chew holes in the sheets when people fold up and unfold the bed with the sheets on it and b) the "works" stopped working in all my sofa beds after about 3 years. They pretty much fell apart. Maybe I was supposed to oil them.
I switched to air mattresses. Let the electric pump air it up. I like them better than the sofa beds, and the guests say they are more comfortable. And, when the air is out and they're folded up, they take up almost no storage space.