My DS7(almost 7) got the small snap circuit kit over the summer and fell in love with it and quickly completed all 100 activities so we went out and got the big box with the computer interface. He LOVES messing around with the various activities...but he has shared that he is ready to try something new...so we got the Lego Mindstorm NXT for him for his birthday next week..can't wait to see his face :-)