I haveused bamboo flooring exclusively for many years, and simply as a gut reflex as to natural versus actionwood, I am only talking about the two types of 'boo flooring but " believe' the "coffee' type is slightly superior to the natural one due to being heat treated or tempered in manufacture. I have no statistics to substantiate this but other bowyers here have felt the same, that the 'coffee' 'boo was slightly zippier in performance.Simply an observation without proof though.