This is THE place for me to park when I have to fly out of SFO, they have been consistently great through the years. The only problem I've ever had was when I parked for a Christmastime trip out of town. When I got back to pick up my car, I found that they'd crammed as many cars as possible into the lot, and had parked cars behind already parked cars... including mine, blocking them all. They had a pretty hard time finding keys to the cars that had to be moved, and I was there literally an hour waiting and fuming-- until I found out I wasn't going to be charged. To me, it was worth an hour's incovenience to save $80. If it wouldn't be worth it for you, better park somewhere else at Christmastime.
Pros: Best prices around, shuttles come pretty quickly.
Cons: Retrieving your car around Christmas time could be challenging.