Been using 5.1.1 on my S6 for about a week now.... I am liking it very much, aside from the slight bump up in speed all around, there's that new "auto stop" function... comes in very handy when you want to extend battery life. (actually contributes as well to the speed, because it frees up memory). And the new camera enhancements are nice! Though speaking of the camera... aside from that manual exposure slider in the camera app, there's virtually no change in the native camera menu. I had to install the 'Manual Camera' app to get to the lower ISO's.
cheers!
[ This Message was edited by: difenbaker on 2015-07-18 14:33 ]