First, I love this style of wallet and this is one of the better ones out there.

Pros
Solid money clip holds a decent amount of cash, not flimsy like some others and easy to open even when full yet secure when closed.
Slim design.
Windowed Spot for Drivers license.

Cons
Max Capacity is about 6 cards (hoping it loosens as it ages)
No cutout in the window so it's hard to slide out a licence or credit card.
The cutout notch for the card sleeve is very small making it tough to take out the cards.

Even with the cons, this wallet is almost perfect for my uses.  To perfect this wallet, put a reinforced hole in the plastic window, notch the center pocket (no notch included), make a deeper notch for the back pocket.