Just wanted to share that I started using this for my 4 year old and 6 year old after the OP posted it.....
and after maybe 4 days of lessons for my 6 year old, he's reading a few words! I skipped ahead on "getting started 1" to where it adds in actual reading instead of just letters/letter sounds, and he picked right up on it. He's ahead in math, so we're still trying to figure out where he is on this curriculum, but he was flat out NOT reading before, so this is awesome!
My 4 year old DD loves that she has "school" to do too
It takes maybe 10 minutes per day for her (I'm not doing the printables yet because we need ink in our printer
)