I am disappointed.

The Genius dictionary was recommended to me, so I laid down the money even though its expensive. I am not impressed. First, it seems you can only jump to other dictionaries within the app using English words. None of the Japanese words in the definitions can be tapped on to do a jump to the other resources for further examination. As well, all of the audio excerpts included are only for the English words.
You cannot search in Romaji, only in kana. I cant find any way to do a Kanji radical search or anything of the sort. It only has a basic word-input search and thats it.
The definitions are elaborate and have very good example sentences, but there is no furigana for the Kanji, and since you cannot select Japanese words for jumping to definitions or other resources, there is little you can do when encountering unknown Kanji.
The app also crashes when I attempt to jump to another dictionary for definitions.

Ive heard the Wisdom dictionary is very good. Kotoba! is also good, especially for info on Kanji, and a lot of people recommend the app Japanese, though I havent tried it yet.
Good luck.

seracera about ジーニアス英和・和英辞典, v3.0.2