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Bottom line.
I started out learning kana, then working through げんき1 and the workbook, did all exercises in there, which took about a month. I thought about doing げんき2 after that. But i decided that now is the time to learn how to recognize and to write the kanji. So i started RTK in late October last year to get that out of the way. So i know the basic grammar taught in げんき1 some vocabulary, and now i am on a good way with the kanji.
If i had to recommend someone who is interested in learning Japanese how to start out - i would suggest going kana -> some book to see if they are really interested in learning the language, and only after that working through RTK.
Doing the whole set, or RTK "lite" whatever seems fit to the person.
The reason for this is that RTK is somewhat of the ultimate proof of will and determination to spend time and energy to learn one part of the language. If someone is willing to do that, then they are on a good way, to learn the rest of the language as well. Meaning the readings either with RTK 2 or some other method, like vocab learning, and what not. Going from basic to intermediate to advanced.
I sure am glad that i choose this path. Because ultimately all i wanted to learn is how to write, how to recognize, and how to remember the kanji. I am sure that it will make the rest of my learning adventure a whole lot easier. Having that out of the way, and only needing to fill the "empty containers" which most of the kanji are right now for me, with meaning and sound.
Since i am very close to completing RTK i will soon have a proof if it was really worth spending my time and effort on doing it. One thing was clear to me all along, i would outright shoot myself, should i decide to stop learning Japanese now or in the future.
Bottom line
It is never too early or too late to learn something which is part of what you have to learn. I can't say much about the effects of learning the kanji the RTK way after having reached an intermediate or advanced stage. If you wish to learn how to write the kanji, do RTK, do RTK, have i mentioned do RTK already? I think i have. Anyway since i, being the Japanese newbie that i still am, are not there yet can say no more about that. But i will get there.
Edited: 2011-01-05, 10:04 pm