I was pleasantly surprised when I received this item.  Though it seems rather expensive, it is attractive and surprisingly thin.  Seems to be of good quality too.  It was a little tight at first, but is pretty easy to use after just a week.  I do have some concern about it wearing out over time, but I will post back it I have a problem.

tl;dr: Simple, thin, attractive money clip.

Update June 2012:
I used this thing daily for around a year and it still looks exactly the same as when I purchased it.  No scratches or signs of wear.  It lost some of its spring, but I have never had it drop money or even been concerned that it would.  One down side is because it is so small I managed to lose it somewhere in my apartment...