I got this set yesterday and I am extremely impressed with it. I always buy the US Silver Proof Set and the Canadian one is so much better. It comes in lens, instead of 4. i do understand the 4 due to the amount of coins in the US set. It is housed in a book and can be removed very easily. On the outside of the binding is 2009. Also, detailed history of the commemorative dollar is given and at the end of the brochure, it gives your unique number out of the total mintage. Will be ordering more from Canada, more distinct coins. They are coming out with a guitar pick shaped coin. Proof Set Link: http://www.mint.ca/store/coin/proof-set-100th-anniversary-of-flight-in-canada-2009-prod530013