UPDATE 1/27/2012:
Since getting these shoes I have been officially diagnosed with Inflammatory Polyarthritis, bone scans show degeneration in every joint in both feet.
 In addition, all of the tendons and ligaments are affected and inflamed.  These shoes are STILL my favorites.  Even on horrible days, these get me through.
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I have Autoimmune Inflammation in my feet.  These were recommended by a friend with RA.

I have had them since May and have worn them barefoot all summer long!  I love them!
Even on bad days, these are the most comfortable shoes I own.
I'm used to European sizes, as I've worn Birkenstocks for the last 20 years.  However, if you're unsure of your European Size, birkenstockexpress.com has a true to size chart.  With clogs or open toe, even though my true size is a 40, I can get away with a 39 or a 41.  However, if there is a heel ridge, do not go down in size.

I will be buying another, more "closed" pair of Haflinger's for Winter!