Never tried Chucks blocks but looking at the prices they are not alot of difference in prices just havent checked shipping. How does boxwood compare to walnut?I bought a mess of blocks from Chuck Passaro and some trial blocks from China. About the same price, Passaro's are boxwood and excellent quality, I'm using them on my Syren. The Chinese blocks are also real good quality and are made of walnut. They do look a bit different so I'm gonna have to decide which to go with for Rattlesnake....but it certainly ain't gonna be the blocks supplied by the kit.