My 7 year old enjoys playing it about every second day and I like the parent information it gives. It offers games according to your child's ability and then moves them forward.
My kids love to play Dreambox. They ask for computer time and are learning math! Price is very reasonable, especially if you buy the 6 month package. I heartily endorse this site. My kindergartener is already in the 1st grade curriculum.
My sweet girl loves Dreambox Learning. It has been a great way to challenge her and keep her interested in math. I have seen her applying concepts to everyday problems and she is now far ahead of the other children in her class. Her favorite part of playing is how the game rewards her with tokens, certificates, etc and tracking her progress. Well worth the money!