I want to try Beast Academy once my son is ready. I've been holding out on Singapore Primary Math for years and just took the plunge to try it. Pretty much everything I want to try I do b/c I'm both OCD and spoiled! I am addicted to used books (readers, living books, good textbooks, etc.). There is a lot I don't own and I better keep it that way if I ever want to pay off all my debt!