I got the black one with the elastic bill strap.  It's very convenient to be able to flip/fold either way and seems very well made.  The strap for holding bills is a little awkward to use with bills folded in half, but works fine if they are not folded at all or folded in thirds or quarters, but of course folding bills makes for a thicker wallet and means you have to take them all out in order to get individual bills.
I originally had one with a magnetic money clip, but had some trouble with the magnet and my credit cards, so after I returned it,  Kinzd sent me this one instead.  Great customer service and followup, obviously.