Great place to park at for Sky Harbor airport. I've never had to wait very long for a shuttle, even after hours close to midnight. I trust this place, which I thought would be hard for me to say for a parking lot for the airport.
You get free water upon exit, and an easily-identifiable shuttle - never go to the wrong lot! Decent prices, and you can always print a coupon online before you check out. I've always had polite shuttle drivers and attendants. It's a great place, I highly recommend it!