Thank you for the reviews! Sounds like Dreambox might be better for DS4.5 as he loves that kind of set up. ixl sound more like something DS3 will enjoy eventually. DS4.5 has always had a great number sense. He's way ahead of where they are at in pre-school and is through most of the K curriculum from what I can tell (he just naturally picks up on the concepts without having to be really taught) so I need something like this that will be fun for him and he won't just sit around for 2 years waiting for most of the other kids to catch up.