The UCS A Wing is the hardest build I have ever built. I previously built the UCS Slave 1, UCS Tie Fighter, UCS 75181 Y Wing and even the very difficult UCS 10240 X Wing. The A Wing was on a completely different challenge level than the other UCS sets I've previously built, which makes sense for the first 18+ UCS set. If you want a big challenge, then this is the set for you. The one major criticism I give this set is there are STICKERS on the custom-made canopy. Why would Lego make a custom-made piece that still requires stickers? The canopy should have been made with the markings painted on, evading the need of stickers that eventually peel off. The UCS Tie Fighter and all other TIE Fighters receive custom prints for the windows and canopies that do not require stickers to complete the final build. However, the A Wing, as well as other UCS sets like the 10240 X Wing and the 75181 Y Wing still need stickers on their canopies, despite the canopies being custom made for the set. Since Lego requesting stickers on the custom canopy, I decided to not even put on the stickers on the canopy, which have the potential to peel off the build or look sloppy if placed on incorrectly.