"I have been building my own Ectomobiles for the better part of 30 years, it's about time LEGO get into this franchise. All that aside, this model is awesome. I highly recommend it to LEGO enthusiasts and Ghostbuster fans. I rated the build as challenging because I feel that some of the techniques can be hard for folks who don't have experience. Especially those who are unfamiliar with the ECTO 1 vehicle. An understanding of the finished product is helpful. While building this I suggest you keep the box handy to reference what your final goal should be. I loved the instructions and my ONLY problem with the set is the instruction booklet binding. I had a hard time getting the book to stay open to where I needed it. Again, an annoyance, but because I understood the finished product I knew what was happening. Even though I have never built this model before, it felt very familiar to me and while the techniques are advanced beyond my MOCs it was easy to put together. I have no problems, no missed pieces or pieces in the wrong spots. LEGO did an awesome job."