I've bought a bunch of different wrist rest from Grifiti over the years. They're the nicest foam pads that I've tried.
I haven't experienced any fraying of the cloth. The foam maintains its shape over time. (Doesn't get thinner where you rest your wrists.) And they're washable too.
The only issue is that the materials vary depending on what vendor they used for different batches of pads they make. For example, the foam in the Notebook Pad might be different than the one used in the Fat Full-sized Pad. And the newer pads seem to be made out of a thick layer of neoprene, rather than two layers of foam (soft on top, firm on bottom) like in the one I have for sale. The texture of the cloth, logo, and quality of the silk screening also vary depending on what year it was made. I'm sure some of the less popular colors might be older stock. Despite the variation, I've been happy with all of them.