We're on our sixth year of RS here and LOVE it. As my girls have gotten older and more advanced, I've made more of an effort to play the games. (It helps that we have lots to choose from now, too.). I've supplemented with various things--MM, LoF, BA. I'm not sure they consider those fun, though (with the possible exception of BA, but it was challenging for my girl). When they were younger, I added in math picture books once a week or so. Of everything mentioned, in my opinion RS is the most "fun."