This is really, very nice. I'm getting to the end of the flash cards I've managed to pull together for Chinese (just HSK stuff, really), and this works so well.

[EDIT: I'm curious, if there is by-default reviews, is there some way to shut off the reviews for sentences I got right on the first try? There are so many sentences that I don't imagine I'd get much benefit doubling back. That being said, I'm not sure there _are_ reviews, I just saw that review projections are in the pro thing, I think?]