I have two Morrison Shawnee risers made of Dymondwood. Likely more stable, stress wise, than wood grown in one piece. It is, essentially, plywood.
It's strong, durable, consistent and fairly heavy. Good riser wood. Certainly not quite as pleasing to the eye as a riser made of a block (or two) of wood but it works great.
Some like it, aesthetically, and some don't. I'd guess that it's "wood's answer to magnesium and aluminum and dark matter risers" although it's not likely as heavy as "dark matter".
Just my thoughts.
homebru