“I went over the first essay exactly a year ago. I was pleasantly surprised that I could follow without going back to the first essay.” [source]
“I feel like the goal of the medium is not to make you remember every single fact, it is to internalize the big picture and the main ideas. In that, it very much succeeded!” [source]
“The Quantum Country series was essential in stepping up my Anki game. The flashcards are well thought and incorporate ideas for building questions and answers that are not obvious when starting out. The authors do a great job at introducing the ideas gradually. For people with a sufficient mathematical background, that want to learn how to use any spaced repetition software effectively, I think the investment of time in going through the entire series is exceedingly valuable!” [source 1, source 2]