I ordered all three of these limited edition puzzles. They are all great but I think Einstein is the most challenging of the three. The puzzle is high quality (ie NOT flimsy, pixilated or dusty)...just a very good "feel" to it. The poster insert is a nice touch and includes a QR code with a link to Einstein's Wikipedia entry. There is a lot of attention to detail and quality like that. I love the theme of these puzzles and hope that they do more of the "Heroes"in the future. Order it while you can!
I ordered the Einstein and Ada puzzles and they look great! The pieces have a good quality feel and the colors are very vibrant. The pieces come in a resealable bag, something I don't see very often, and the puzzles include a really nice poster. I haven't finished either of them yet, but so far the pieces fit together nicely.