Perfectly Simple Works Perfectly
I just started learning Japanese this year and it was my brother who showed me the PC version of Real Kana. I used it multiple times a week, using it maybe for 15 minutes a day. I knew every character faster than I ever thought I could, took maybe a week. I always hated flashcards so this was the perfect alternative. When I found this to be on the Iphone, I could not wait, I still have Katakana to learn :D.
Pros:
User Friendly Interface
Simple yet effective
Great Price
Good for the on the go person
Cons:
None that I have found, will update if i do though
ToastyGoodness about
Real Kana