I have used JM shaft wood and what I got from Chuck was better. JM was white and somewhat softer. I got the medium grade stuff from Chuck and I personally like it better than the Champeau, and besides, from what I understand, it might take a while before you can get an order from them.
I also got a batch of not-so-white wood from Chuck as a request and I think those shafts are more dense, hit truer and have a much crisper tone.