"Received this as a birthday gift, and wow, was I impressed with Lego Technic® ?! I Know Lego from when I was a kid, but I never knew Lego grew into such an awesome company. Immediate new hobby for me :-) It was so fun to build this copter and I really took my time to savour every moment. I was left with about 5 parts which I assume is spare parts as I went through the book again and closely examined the picture on the box, but I then just used the spares and placed them into other areas (LEGO®, CAN YOU SPOT WHERE I PUT THEM?? :-) I just became a Lego TECHNIC fan for life!! Now to choose which one to build next...."