He developed this method after moving to japan in the early 80s for a position at a research institute. In a few months, he developed and applied his method to learn english meanings (but not japanese readings) for all ~2000 standard-use kanji. When his colleagues asked him what he'd been spending all his time on, and he told them that he'd finished learning all the kanji, they didn't believe him. Not because they didn't believe he'd done it so quickly, but because they had never seen any foreigner ever learn more than a few hundred. After demonstrating to their satisfaction that he'd really managed to do it, he was told "go write a book about how you did it".
I've been working my way through RTK (with the help of anki) for several months now. The method really does work. I'm at about 1500 out of 2200. It's getting harder the further I get, but all told I don't think I've spent more than a hundred hours or so over the course of 4 months.
For chinese learners, he's produced books on remembering Hanzi, simplified and traditional. I think if Moser had had access to these books, he might have been a bit less despondent about the task of learning the characters.