I started with Textfugu a couple of months ago (already knowing the kana and a bit more), went through the first seasons and enjoyed it. But then I felt a bit lost without knowing many kanji as I wanted to read some texts, subtitling on tv shows etc. Therefore I decided to pick up RTK (bought the book and downloaded the Anki deck for my Android), which turned out to be a really good idea. I am already 30% through the kanjis, and all the other learning already goes so much smoother because of the kanji knowledge.