Having flown in here on numerous occasions, I will say it is a nice airport. It is big and sprawling, but there are some very nice food and shopping options, and I have normally encountered courteous staff. On my most recent trip, I received a good dining recommendation, and helpful staff pointing me to a TSA check in that had short lines, but was still close to my gate. The Rental Car hub does require a shuttle bus, but they have them running continuously, so I have never had to wait more than a couple minutes before jumping on, either heading to, or coming from the Rental Car places. Overall it is usually very busy, but as far as airports go, not a bad spot for a layover.