My set came in over the weekend, they look great and I was really impressed with the details on the coins.
One question, why is the recess on the back of the coin is so deep?
it's a personal choice, to allow :
1: the possibility to platstify the private key label on each faces ( for durability )
2: the possibility to add a second label ( plastified too) with QR code for an easy readability of it..
i personaly used to add the two labels formats.