I picked this up based on a recommendation from Grognardia, in particular, the 50+ page chapter with tools on building a sandbox campaign. I haven't read much of the PDF outside of that, though what I have read of the setting is well done and quite cool. But so far I'm finding the sandbox chapter very well done and it should prove quite useful for my upcoming campaign (which will either be Pathfinder or 4E, though at the rate I'm getting it ready it might be D&D 6E...in any case, you don't need to be playing Labyrinth Lord to use this). The Asian feel is cool, though it will require some tweaking on my part to work with a standard campaign (Western European style).
[4 of 5 Stars!]