I've heard great things about these kits - both from a tinkering perspective and from people who have used them as actual homeschool curriculum. We just got one delivered to our house last week! I'm looking forward to playing with it! I have a DS9 and a DD almost 6. My kids dug in and starting building things with it immediately, but I also want to go through and reinforce some physics concepts we learned this year. Mainly for DS, but DD enjoys coming along for the ride too.