I've gone a work day here and there without a case. It's lasted but I'm not used to how slick the phone it. haha After seen all the drop tests than people uploaded.. I trust those more than a few reports of broken glass here and there... But, in reality. I like to keep all my phones in the best condition I can possibly keep them in, and that calls for a good case.
It drives me crazy how slick phones are now days. I don't really like cases but they are so slick I have to use one. You'd think these manufacturers would make phones that are meant to be used and not just sit there looking pretty on a desk. The V10 was a great phone that didn't need a case.