Worth it
Theres a good selection of basic vocabulary, and several different ways to learn it that can help any learning style and that compliment each other nicely for really learning and remembering the words.
Theres not much to help you learn grammar and basically nothing to teach sentence structure, so if you want to learn that youll need to go elsewhere. However, this vocab is a great place to start, and the app is well put together.
Highly recommend.
Flatpancake05 about
Learn Japanese™, v2.3