I wouldn't recommend the Spinnaker. I have one of their card carriers, and the lack of grip on the Spinnaker means if I'm not careful when I open the carrier, I launch the contents ("Yard sale!"). I ended up lining the pockets with duct tape, and it's a little better, but I still don't care for it.
I've been carrying an All-Ett for about 3 years now - needless to say, I like it. The Spinnaker cloth has held up very well. In fact, I can't detect any noticeable wear on it at all. And, I'm a very active person, I don't sit around my mom's house unemployed for year after year like so many of my friends.
When the wallet is folded, it is impossible for your cards to fall out. It is true when it is open you do need to be careful about cards sliding out. It's not really an issue for me any more, since I have so many cards I carry friction keeps them from sliding out.
My suggestion is to just get the right size wallet for the amount of cards you carry. I have the smaller bi-fold wallet they sell as well as the full size one, but like I said it wasn't quite big enough to carry all the cards I have. It might be perfect for you, however.