We got this for our youngest. Can confirm that it's easy to follow and absolutely encourages exploration of the post build abilities or modifications. Mark is doing great things for kids science. Phat Gus caused my middle child to start exploring zoology as a career!

Also, the subscription is worth it even if a single purchase option would be nice just to try things out. Go ahead and do it if your kid is at all interested in hardware, robotics, or tinkering in general.