I sold my Shield 9.
No problems with it -- it was an excellent pistol. I too am amazed at how few criticisms there have been, and how it does not seem to have any of the problems that seem inherent in other small but powerful pistols.
I sold mine because it did not fit my CCW "system." I am sticking with my S&W Mdl 642, and added a Mdl 42, for carry, because they fit in a pants pocket so well; and a family of full-size M&Ps (9, .40, .45) for range, vehicle, and open carry or winter belt carry. The Shield was just a touch too big for pocket carry. And I sold it knowing that, if I change my mind and think I need one to fill a niche, I can always get one in the future!