I watched this last night, very fascinating indeed. It is worth catching if you get a chance to watch it. My only quibble, and it goes for pretty much every documentary I see on MA/ Japanese related topics, is that the narrators learn to pronounce the Japanese names correctly, it's not bloody pronounced sam you rai, it's pronounced sa moo rai! I won't even go into the Japanese sword expert at the Victoria & Albert museum's pronounciation of Masamune! <rant over>
rgds
Bryan