In around a week, I have almost caught up to what I learned in 2 years of my school's curriculum. The up-front price that they ask for may seem intimidating for most people at first but I can assure you that it is worth every dollar. You may as well be saving money by investing in Rocket Languages as it is a one-time purchase as opposed to its' competitors. I've only barely scratched the surface of this learning tool, but if it's as good as I think it is then I have nothing to worry about.

Nonetheless, it's not perfect (for most people) and it shouldn't be your only resource if you're learning Japanese but if it is then I guess it's good if you are an absolute beginner and want to focus solely on grammar/speaking. (I have not touched the kanji yet so I can't say too much about that)

Overall, this is definitely worth checking out if you are serious about learning a language.