There is a lot to like here.
The material feels good and it looks like it will get old gracefully. The layout is well thought. The flap behind the rivet is there so taller currencies like the dollar do not interfere with the closing mechanism. The coin slot and long storage card slots take almost no space due to the material used, and it keeps it's contents secure and it is easy to use at the same time.
You can also use the folds of the wallet to keep a key stored, although I am not sure if it is recommended, as it may create some pressure in the folding points and it could affect the integrity of the wallet.
Two complaints about this wallet (which are essentially the same):
1. It could be a bit smaller. It is NOT a big wallet, but it is about 1,5cm higher and wider than a standard credit card. I come from a trove cash wrap, which is a similar wallet, and it is a bit smaller than this one, as that wallet is about the same width as a credit card. (The Kamino is slimmer in girth but a bit wider)
2. You need at least 3-4 cards on the quick access card slot so the cards don't accidentally fall out. Because the wallet is a bit wider than a credit card, if you only insert one or two cards the extra width makes is so that the wallet does not grip the cards properly. You need 3 cards so the wallet grips them, and 4 if you don't want them to fall even after hard a hard shake. As a counterpoint, if you make the wallet less wide, you would only fit 2/3 cards in this slot as opposed to the 5 you can fit now.
I would still like to see a "less wide" version of this wallet, as it is my goal to have the most compact wallet that can carry cards, cash and coins and this wallet is close to perfection.