No, I haven't used it. I've never heard of it, so I'm no help at all.
When DS8 was 6 and we pulled him out for emergency homeschooling, I had trouble finding a secular curriculum that was both sufficiently rigorous and sufficiently accessible for a young child.
I ended up checking out of the library science books on topics that interested him. The downside was that it was not a very organized, linear path for his studies. But that was really the only downside. (And that only affected my desire for a linear path. It didn't hurt him.) It was easy to tailor the curriculum to his needs and interests. And at 6, he doesn't need more than to be interested and excited about science. Anything else is gravy.
It worked quite well.
Feel free to ignore though. I know you have a lot on your plate so you may just need something that's done for you.
