I haven't played this yet, but after a read-through it is an entirely creative and inspiring supplement. I will roll up a few characters as soon as I get a chance, which for me is always the mark of an engaging game.
It looks great. The art is rad (though the cover to my eyes isn't quite as awesome as the rest) and it's put together well. I like the comment font a lot, it's a neat way for the writer to really clarify and emphasize key points. I played Oriental Adventures again a few years back and while it was fun, this would have been so much more epic.
If I have a complaint, it's that it feels much more faux-Asian than truly Asian. No Korean Old-Boy weirdness or Burmese political shenanigans. But that's not the point of this book and I'm not really blaming it for that.
The solo adventure looks like a lot of fun. And the monster manual alone is worth the price of admission. I'll definitely add a few of these to my random encounter tables.
As a final note, the Adventure Island module blurbed in the back looks very promising.
[5 of 5 Stars!]