I just did a couple minutes reading up on this thing. For anyone looking at the ebay auctions, there are two versions of this from what I was able to find out. The -D version (Domestic, as in Japan) and the -W version (Worldwide, meaning everywhere else, like the USA). Apparently, the -D version tuner only gets local radio stations in Japan, while the -W tuner is set up for everywhere else.
All this might be wrong, but I just wanted to throw out there what I read up on in case somebody stateside decides to go for it and ends up with something other than what they were looking for.