Mark U. - Bothell, WA
Arrived at 5:30 AM on Thursday. The Sandstone lot was pretty easy to find and is close to the airport. There were several other travelers checking in and waiting for the next shuttle which was scheduled for 5:40 AM. Was able to park and walk back in time to catch it. It was about a 5 minute trip from the lot tot he first airline drop off.
On the way back, I happened to catch the shuttle right when it was picking up two other travelers so I cannot truly comment on wait times for pick from the airport. Ride back to the lot was very short. I was dropped off right at my car and the asked for the claim ticket which I did not have handy. Will have to remember that next time. The driver did accept the parking tag I had in the car (I had the keys after all).
I was not not sure where the courtesy phone was at Seatac to call the shuttle company but this was the first time I have tried off-site parking and the overall experience was positive.