Our PHX airport dining options are getting better and better...
I purchased food from this airport Sauce location twice to date and I've been impressed - their food is consistent with their restaurants around town. While their food isn't five star worthy, it's pretty damn good for the price and the fast-casual model. I recommend the vegetable salad (I add turkey for extra protein sometimes) and their turkey, ham, salami panini (I order mine without ham).
Service is friendly enough although it's not the fastest, so I don't recommend dining here if you're cutting it close trying to catch your flight!
Fox Restaurant Concepts are taking over Sky Harbor - today I noticed that they also opened a Modern Burger and Blanco between gates A4 and A5 (terminal 4).