Yeah, the keys are a little rattly, but you don't really notice it while typing.
Layout is amazing, had to remap one of the special Japanese keys to a Windows/Super key, but that was about it. Still haven't figured out the TRON layout, not that I care as a Colemak user (there's two different keyboard controllers I'm pretty sure with the μTRON).
I also like the fact that it's uniform 45g Topres (I don't like the weighted keys that much).
I never got the wrist pads like webwit did, they look awesome; however, since I use a standing desk, they are not really useful to me. Highly recommended if you sit while typing (9,450円 though...).
As for a place to get it...hmm, well, I only know of 1 store in Japan that actually carries it,
Cleverly. There are a few online retailers though,
here, and the
actual supplier.
Unfortunately for you, is that none of the online retailers actually ship outside of Japan. So you pretty much either have to visit Japan, or use a broker (I've checked their web stores to confirm this, you might get lucky if you can send them an email in Japanese though...).
Some more
pics.