Why? I prefer giving AT&T the opportunity to get it right rather than push a flawed update. Look at the 5.1.1 push from other carriers on the Galaxy S5 forum. AT&T was one of the last ones to push 5.0, but they got it right, whereas the push by VZW and others was majorly flawed.
I know this was just a patch for security..... but I swear my reception is a bar lower.... which I normally wouldn't fuss about, if I had full most of the time... but I dont... I usually only have 2 or 3..... so now this puts me at 1-2