"This set is an average set. The build itself looks spectacular and a great improvement from the 2013 version. However, I am having trouble with the drilling function. I have checked my instructions over 10 times and there is no mistake. The problem seems to be when I add the small black gear that connects the thruster and the drill. When that small gear is attached the red axles stop responding to the right wheel. It is quite frustrating and really disappointing that I am unable to use the main feature of the set."