I finally get to have a taste of the hype! A friend of mine just came back from Japan and brought me a pair of S500s, only $35 when converted from yen!
First impressions: superb build quality, couldn't be better for something in this price range. Is better than many cans a couple times its price. Mother of bass, at first it sounds a little muddy, but it does extend quite deep, I'm sure after the 100hrs of burn-in required, it will tighten up dramatically. I am quite a bit disappointed in the high range though, not much sparkle at all, especially coming from the FXD80 and the Panasonic RP-HTX7, both of which are quite bright. Again, I'm sure this will change once the required burn-in time is achieved, same with my FXD80s. Not much to say about mids, I'm going to wait until everything is burned in to make a final judgement.
WS55 pads already ordered, $10 shipped from AT Parts. Can't wait!