I can now speak from experience, having just bought one nearly an hour ago.
In it, I am able to fit 2 credit cards and my debit card in the 3 cc slots. On the other side, my health insurance card and license fit in the other small slot and in the deeper one right above it, I was able to fit about 2 more cc's. You could fit 3 if one is thin.
I only carry what I need, so for me this is perfect. The billfold part itself is not too deep, just deep enough, and I love that the change part is external and zips. It is able to hold quite a bit and yet I doubt having a lot of change would damage or affect the wallet's shape in any way, as it did with my Burberry one. The external part has 2 pockets and on one side I put change and I'm using the other side for any receipts or small papers.
It's really perfect for my needs!