The set was fun to build as it gave me something to do, but annoying because some of the pieces caused me to have backtracking moments. It makes it difficult when you have 4, 5, 6, 8, 10 long pieces all the same color and needed at the same step, but the diagram doesn't describe where to put it well. Off by one later on and the whole thing set me back by many many steps. Other than that the platform was sort of difficult to make stick together, but with the underside made it a bit more sturdy. All and all a good build for the price. Plus the helicopter looked awesome once I was done.