Note that the platform under the arms and in back is mostly a thin black matte fabric, not the faux leather. There is just a small strip of faux leather toward the front (see my picture). This is an unfinished and cheap look when you raise the arms or if the back of the sofa is visible. This is also different from what is currently picture no. 4 in the listing.

Also, there is not a solid platform under the material on the sides and back (in case you were expecting that) but rather a 1" to 1.5" wood (or manufactured wood?) frame. 

The hinges on the arms and back are nice and work well. 

The padding is lacking and does not feel like memory foam. When the sofa is in "bed" mode -- with the back totally flat -- someone lying down can feel the frame in the middle, like a bar. A lighter person can sleep on this, but I would hesitate to use it for a heavier person. Given the construction, I am skeptical of the 792-lb weight capacity currently given in this listing.