"I admit I bought this for my 5 year old grandson, thinking that he would have fun with it once built, and I wanted to try building something a bit more challenging. The challenge was increased by the enthusiastic assistance of my grandson, who frequently decided to put pieces together to make his own creations, after which he didn't want to give them up for the actual build. I tried working on it in the evening after he was in bed, but by then I was too tired to concentrate and twice found myself cursing Lego for errors in the instructions before realizing I was just reading them incorrectly. Sigh. Once complete however, my expectations were realized. He greatly enjoys it and all the little features built in (he loves that he can steer it!), and I enjoyed the sense of accomplishment once it was all together and working properly (much to my surprise - and my wife). A great toy and worth the price. Now.... if only the excavator was the same price!"