Jim Rion's site is an excellent resource for all things Japanese razors. One should bear in mind that these razors were not meant to be used by, well, users, but by barbers. Therefore I personally feel that they combine all the disadvantages of a microtome with those of a 4/8 razor. They are unnecessarily difficult to hone, and to use. Yes, foreign looks and a funky name certainly add to their mystique, as do the finicky and absurdly priced natural hones which inevitably go along with them.
So, yeah, been there, done that. One of my staff inherited them, and I think they've never really seen any use since then. Thankfully, they were in the only-mildly-insane price range.