I bought a big chunck of CA buckeye burl and thought the same thing you did when I cut into it. The first knife I put it on I don't use much, but the handle has not changed since the day I put it on. The second knife I have carried every day for about 8 months. It is a small knife that hangs upside down on my belt. I'm a contractor so it get abused alot just hanging there. That handle is starting to show some small indents on it. I'm not sure if any wood would hold up good under those conditions though.
By the way, I didn't send either of the scales out to be stabelized. I just used thin super glue on them.
Joe