A few months ago, I gave WaniKani, a Japanese Kanji learning tool, a try - and progressed through the first few levels of study. It's similar to Heisig's "Remembering the Kanji" in the way it uses mnemonics to aid with kanji recognition and recall. Each day, you get lessons and reviews to complete, and the reviews change depending on your performance. I liked it quite a bit myself, though I had to stop when my trial ran out; I wasn't ready to put money into an online learning tool just yet. I'm curious, though: have any of you given WaniKani a try? If so, what are your thoughts on it? Is it viable for learning the core kanji effectively?