I used MUS Alpha with both of my kids. My son loved the illustrations and short, yet engaging DVD instruction. Both of my kids make vacuum sounds when adding up to ten(it's a trick for memory in the DVD-every number wants to be a ten). It is a great program with a website with a worksheet generator and quiz capability that we enjoy if we are on the road and don't want to take too many books with us. We love all of the levels in this program so far!