My son is 4 1/2 and so far he loves this. Only him and I have played so far, but I can imagine if he ever gets to play with his friends or when Mom gets to join he will love it even more. I haven't tried any other table top RPGs for him, but so happy he likes it.
One rough thing for me (it's about him though, so it's definitely worth it) is that I've never played a table top RPG before. I've played plenty of video games RPGs though, so I understand the concept. But filling in and trying to make sense of some of the gaps in the instructions and story and how to actually do the gameplay has been a challenge for me. I would love to see a more easily accessible version (no previous RPG experience required).
[4 of 5 Stars!]