Very efficient, very convenient to get to and to access your flight. I've flown into Sky Harbor in years past and never had any issues. And with the recent upgrades within the terminals as well as outside of them (i.e, the cell phone waiting areas with flight information), this airport reminds me of another that is pleasant and easy to fly into (Tampa airport).
Now if only we can get some of the airlines to follow suit. Outside of that, I love, LOVE Phoenix Sky Harbor! Hopefully, so will you.