My son and nephew wait every month for their boxes to arrive. Not only do they learn to think like an engineer, they also play afterward. The design is really cool and includes some really funny tips. The whole package is a lot of fun. Plus, we're from Spain, and the shipping and customer service are fantastic, excellent. I also wait for the package to arrive to see my son put it together and learn from it too. We're big fans of Crunch Labs and Mark Roberts.