The biggest thing with AAS for me is that it is so systematic, so logical, and so incremental. Rules based Orton-Gillingham phonics technique applied to encoding AND easy to use! Unlike many OG programs, AAS is scripted, so clearly laid out, and open and go. It is so well designed, I was just thinking today on the way home from grocery shopping how much I love it (yes, I'm geeky that way) - I would have gladly paid twice the asking price. The ease of use is totally worth it to me.