I have now been using Level A for three months with my 5.5 year old daughter and am very pleased with the results. I feel that the new concepts are presented in a way that really helps her understand them the first time, and then they are reinforced through the games. The manipulatives, especially the abacus and the parts to whole diagram, have really helped her understand that meaning of numbers as well as adding and subtracting. I also appreciate the variety in the lessons; my daughter has learned to approach equations through several different methods which keeps her interest and also trains her to think beyond the obvious. We're breezing through Level A with very little difficulty and will probably go ahead with Level B during the second half of our school year. I would highly recommend this program to anyone!