I've been using SRS (anki, ankiweb, ankidroid) for almost four years now. I'm up to 4000 Japanese sentence cards and my amazement is constant. When I started I thought I was fooling myself, there was no way I'd be able to read real quantities of Japanese. Instead I can now read the manga for the anime I watched as a kid and enjoy the stories I thought had ended. I've gotten into a rhythm, four new sentences per day w…
Did you use it for kana too? How did that work for you? I downloaded a nice kana set (with audio) but somehow they just didn't click. Anki eventually classed most of them as leeches and I stopped trying.
Don't worry too much about kana. It feels impossible now but it will become second nature. At some point you will hate it when someone uses romaji since kana is so much easier to read.
I do remember using the "Remembering the Kana" book: http://www.amazon.co.jp/Remembering-Kana-The-Hiragana-Kataka... which I can recommend 100%. The 3 hours claim is accurate from what I remember but do follow the book's suggested breaks.