Comparing the illustrations in TFA to the thing I'm leaning on, I think it is constructed of a core of side-pressed pieces, with a thin layer of plain-pressed pieces giving the working surface and underside.
I've had it for < 1 year. It is a little soft, and shows dents and scratches where I set down moderately heavy objects with too much force, but it still looks nice. I guess I can think of the marks as evidence of actual use and life.