Spaced reptition isn't exactly a time-saving study method. It takes lots of time to build and maintain a large deck. For very small things to memorize (like the

Spaced reptition isn't exactly a time-saving study method. It takes lots of time to build and maintain a large deck. For very small things to memorize (like the kana), it's probably easier to just make flashcards. But it's fantastic when you need to remember large parts of a very large flashcardable set of information, like "the kanji" or "new target language words". And it's best when you have already made a good start on the topic.