How to chose the right sofa bed

In the world of sofa beds, the options have only gotten wider. Designers have finally realized what a great asset a sleeper sofa is to a household. What began as cumbersome and springy pull out couches, eventually moved on to smaller and simpler futons and finally today to sofa beds that are actually nice to look at, comfortable to sit on and make as good a bed as, well, a bed.

So what works for you and your space?