Although there is a kind of black legend that states that a sofa bed is ugly as sofa and uncomfortable as a bed. Perhaps in years past was like, but the manufacturers and designers are careful because they are increasingly attractive , more comfortable and more suited to the pockets and needs of new housing.
At the time of purchase or choose a sofa bed is important to take into account if you use it daily as a bed or be just for occasional use.
The everyday sofa bed will be more useful if you have a simple opening and it is imperative to have a good mattress to make fruitful rest. Try it in the store open or closed, it is something that will impact not only in home decor, but in your health and everyday comfort.
The occasional use sofa bed may not have to spend as stringent requirements, perhaps the mattress does not matter much and aesthetics play a more important.
Always consider the room where you will be and the space available so you will not find with surprise that does not fit in that room once deployed.