My 11 year old got the annual subscription as a birthday gift from grandma. He seems to enjoy it, but I'm not sure it was worth the money. Now that we are in month 6, it seems less exciting (and days/weeks can go by before he does the project). My 8 year old still seems pretty interested (though he might just be a little jealous since his brother gets the box, and sometimes lets him help assemble the project).