I translate Japanese to English for a living, so I use dictionaries on a daily basis. And while I probably dont absolutely need one on my iPhone, I figured it might come in handy and I was curious what it was like. There are better dictionaries out there, but this is certainly not a bad one. The entries are on the short side, but its very attractively presented and controls very smoothly. As another reviewer mention, there is no romaji (Romanized Japanese), and that is because this is intended for a Japanese audience. I dont think you can fault it for that. My main complaint is that there doesnt appear to be any way to look up words within a dictionary entry, or to look up words in another application, such as email. This is probably hard to implement on the iPhone, though, because it lacks any means to select text, or to copy and paste text. Overall, a pretty impressive little dictionary.