"I bought this set because I thought it would be fun to try a 4000+ set. It was fun building it. I didn't sort any of the pieces but did take someones advice to build the 2 towers at the same time to save time. It was a huge help. You will also have less errors as you go. The draw back was the bags not being numbered but it made it that much better. You had to think a bit about how to put it together. I would love to see more sets like this. Maybe an ice hockey areana or football stadium could be cool."