Looks like it might be an OK shoe for the right person, but I am returning my pair.  First, I am not a runner.  I am a hiker and a few ultralight hiking forums suggested this shoe as an ultralight camp shoe.  They all say it weighs an amazing 4.something ounces.  That's what the review site says, too.  I couldn't resist trading in my 7 ounce pair of Waldies for a 4 ounce pair of running flats, so I got a pair.  Except that I misunderstood the weight listed.  Not that I can see it specified anywhere (it must be common knowledge, but how was I to know when it just says weight=4oz?), but it is 4+ ounces EACH, or 8+ ounces per pair.  In other words, my 7 ounce pair of Waldies sandals is lighter, so the purchase of these shoes was unnecessary.

Also, I ordered a size 9 pair (I'm normally a size 8.5), and for the life of me I couldn't figure out how to put on these shoes withought breaking them.  The material is very delicate, not stretchy, and the heels are very stiff.  Since the top doesn't stretch much, I was scared I'd either break the top fabric of the shoe trying to stretch my foot over the heel, or I'd destroy the heel by crushing it while trying to get my foot into the upper part of the shoe.  Since I figured I'd be returning the shoe, I didn't want to try any harder, so I was never able to actually get it on my foot.  Again, that may be a common thing about these running flats, but I've never seen a shoe that felt like it would break while putting it on.  So even if it did weight 4 ounces a pair, I'm not sure it would have worked for me.  Oh well, it was worth a try.