I was on vacation recently and used Pix all over---I got many great photos that were clearly better than what I would have gotten with the stock app (the built-in comparison feature is a great idea), even on landscapes where there weren't faces to focus on.

Pix also managed to take a fantastic Live Image of my sister and me, which is really special because I don't get to see her very often. Thanks to you all for that.

Chief area that I think needs improvement is on general speed optimizations, startup is slow and feedback when taking a shot could be clearer (i.e., when is it done after I hit the shutter?).