I’ve paid for Anki on iOS and have gone as far as exporting flashcards from Emacs/org-mode which I keep in version control. I normally use it for specific information like runtimes of algorithms for interviews, rule of thumb numbers for doing estimations, etc. I also can imagine how medicine students use flashcards for remembering dozens of muscle or bone names.

However, I’d be very interested in learning how people use SRS for remembering information they read on books/articles. Do you state new concepts as Q/A? Do you save interesting facts, or things you think might be useful in the future?

I think this second type of information is not well suited for flashcards. The article seems to imply it is, though, and I’d love to be wrong about it.