A must for students doing self-study!
It's great if you see a Kanji you don't know. Although, it's sometimes challenging to figure out stroke order if you come across difficult Kanji. I generally use it all the time. It's good for practicing new Kanji you learn. I definitely recommend it for anyone learning Kanji.

extremely useful
though its not made for beginners in Japanese

i love that if i find a kanji i dont know i can just copy it down even though i don't know the stroke order and it'll tell me what it means. While it does its job as a dictionary, sometimes i wish it'd teach me the stroke order, but overall very good for what it's meant to do.

Japanese-English Dictionary on DS
It's much better than a book dictionary, simply write in English or Japanese and it will get the translation packed with cases of use and more.

Great software overall.

Excellent
This is a great language tool, but beware, do not get this if you're just starting Japanese study and know nothing about Japanese. If you know some obvious kanji, the difference between hiragana and katakana and some other various language need-to-know hows you'll fall in love with this product just like I did. Another plus is the pictochat expansion, but woe it is still not wi-fi.

Awesome dictionary!
This dictionary has it all! English, Japanese kana and kanji dictionaries. It is actually like several dictionaries in one. Understanding kana symbols is a must, but vocabulary and kanji knowledge are optional! No writing practice or games, just reference. I suggest you buy it with Kageyama Method - Dennou Hanpuku: Tadashii Kanji Kaki to Rikun if you are not yet skilled in Kanji.