Just got mine.

Looks cool, but I'm slightly worried: because it doesn't ~look~ like a standard wallet at first glance, I'm worried it might end up lost in a pile of papers on a desk, or get knocked in the trash, or just generally not get the elevated treatment a standard wallet would receive.

"Hey, have you seen a wallet around here?"

"No."

(I'll update this review in a couple months, after I actually use it for a bit.)

Update (6.26.2011)
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It's nice and thin, so sitting on a lump is never a problem. However, EVERY time I use the wallet (taking out cash or a credit car) I find myself having to reseat the cards inside. They are in constant danger of slipping out.

The lack of storage slots (there are four, but only a fool would use the outer two card-spitting ejector-slots) is another problem, forcing the user to stack cards. (Though the stacking somewhat tightens the wallet's grip on the cards.)

This is something I use everyday and really don't like at all, and I regret having kept it.  (I'm shopping for a new one today.)

Update (5.18.13)
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I still use this wallet every day. It's my front pocket wallet, that I only keep a couple bucks and a couple cards in (so if i get mugged, I can throw it one way, run the other, and not lose much).

I gotta say, I do like when cute cashiers go "omg is that a wallet?", which happens at least once a month. :)