I prepaid online I arrived at 5:30 p.m. on a Thursday. I checked in at the office which was quick and easy, and the van took myself and one other person right to the airport. It's only about 10 minutes away from LAX and they have nice vans. The driver played music and chatted with us.
My flight arrived at 8 a.m. on Monday morning. I called upon arriving and the shuttle was there in 18 minutes. No other pickups, so we left LAX right away. When we arrived at the lot, my car had been pulled up in the line of cars ready for pickup.
Literally I could not be more pleased. I already made a reservation for the next time I need parking for LAX, and can't wait. Without hesitation, I recommend that you give them a try.