This puzzle was really fun! The materials for it are top notch, with the unique piece shapes bringing extra challenge. You'll never fit two wrong pieces together seamlessly by accident--it'll be obvious when it's wrong.
This art is also PERFECT for puzzles, because as long as you're sharp-eyed, you can find EXACTLY where a piece should go--no guessing involved. To me, that aspect is particularly important! You don't have to try every angle of every piece to get things to fit. Instead of a tiring guessing game, you use your dang your brain. And that's far more satisfying!