At the risk of repeating what everyone else has said, this product is excellent. The page quality is so crisp and sharp it looks like it's been generated from the original DTP files rather than scanned like most ex TSR PDFs. The game is an eminently playable fantasy wargame designed to mesh easily with 2nd edition AD&D, but it plays perfectly well on its own merit and should be easy to adapt to 3rd edition+. I used to use this for semi-historical games of Aztecs vs Conquistadors which the basic rules handled fine.
If the rulesystem has a drawback it's that it's a buckets-o-dice system that uses most of the polyhedral dice types, so you may find yourself having to buy a bigger dice bag.
I've been eagerly waiting for this game to emerge from the Wizards' vaults, and can highly recommend it.
[5 of 5 Stars!]