Nice clean airport with lots of places to shop and lots of food options.  Terminal 4 is nice.

Two things:  

1.  The marathon walk from the Southwest ticket counter to the D gates...good God, they need a tram or moving walkway.

2.  The Security bag screening machines are old and tiny; my bag got stuck; it's NEVER been a problem at any other airport I've been through (SMF, LAS, SNA, ONT, SAN, BUR, SEA, LAX...)

Oh, and if you rent a car, be sure to allow extra time because the shuttle ride to/from the airport itself is at least 10 minutes.  But it's a nice rental car area...