Alright, I gave in and bought Japanese:
It's a very, very solid dictionary app. The only thing I'm not so sure about is that the non-search interface is very geared for "Go get Japanese" as opposed to being language neutral. The only reason that bugs me is that I've used Word Tanks for years, and they're oriented in the opposite manner.
That said, it's been a terrific tool for studying Kanji since I got it. The only complaint is there's a known (and pleasantly published) bug that prevents you from saving your own saved lists of words. Luckily that has already been patched and apparently a built-in flashcard player will be included at some point in the future.
I couldn't not support someone who put that much effort into this. $20 is a fair price, given that my WordTank V80 Touch was like $250
EDIT: Oh yeah, you can actually use the Chinese character IME to input characters to search, but note that even though it somehow has unicode equivalency, not all Japanese Kanji are recognized by it (frustrating at times)