Pretty decent experience. Got here at 4:30am on a Friday, and the shuttle picked us up quickly. I think that we waited for about 5 minutes.
He took our bags to the back, and brought us to Terminal 1. Took about five minutes to get there.
Once we returned, we waited for the shuttle on the ground floor, or 'Level Zero' in the designated area. There is a map just outside of the door showing where to find the shuttles. We waited about 10 minutes this time.
The shuttle driver drove up and down the aisles dropping people off near their cars. We paid before we left the lot at the kiosk. $10/day. Kind of expensive, but better than the main parking at the airport.
There is a 'Cell Phone' lot at the entrance to this parking lot. That way you can simply await your arriving party, and head over to pick them up once they call you. I also suggest taking a photo of the closest parking lot marker to your car. This way you won't forget where you parked.