I had been patiently awaiting for the Tumbler to become available again on the Lego site. Once I saw it was back I jumped all over it. Having read prior reviews and build times, I decided to take it an hour or two at a time. The 11 hours of build was spread out over two days on the weekend. The build was very challenging. It was certainly different from any other Lego set I've previously built. The angles made it difficult and had me second guessing myself at times. But, I just used the pictures on the box as a helpful guide when I felt I was too lost! lol Something I found interesting is when I got to the part that the tires went on, I thought I had done something wrong. The tires would wobble when I pushed it back and forth. But, once I got the rest of the model built and the full weight was on the tires, they no longer wobbled. Amazing how not only the look but, the weight of the model was taken into account in the design. Overall, a great model to build and it looks fantastic on display in my living room!