Fantastic product!! I have a 7 and 5 year old girls who absolutely loved it. Putting it together was relatively simple. I supervised the construction and it took them about two hours to put it together over a couple of days. The 7 year old did the bulk of the work and the only reason we spread the work over a two-day period is because we had to wait for the paint to dry (cheap spray paint for our first project). I did a little research beforehand and purchased the engines and wadding at the same time we purchased the kit, so we had everything available when it was time to launch. For about $50 bucks total we had a great time. The Estes website offers lesson plans free of charge which enabled me to confidently discuss some basic concepts with the girls. They really enjoyed it! Moreover, we set up assigned launch positions, rotated them around, and they loved the entire launch production. We used two different engines and both worked great. Two A8-3 engines to start out, then we switched to a B6-2. They loved both. Naturally the B6-2 was a bit more exciting due to the extra altitude achieved. As a dad who is gently nudging his girls towards STEM related subjects, this was great. We spend quality time building it, and had a “blast” launching it! Read more