I used them once, sevral years back. They were off airport, but had van service. Pay close attention when picked up on the way to the lot, so you can find it to return. It's not the easiest location to get back to, the first time there. The location may have changed since the Olympics.

The other rental agencies are directly across the airport drive from the terminal. (100 yd walk) and very convenient, and worth a few dollars more. (Again, I don't know how much of this may have changed for the Olympics)

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Have a nice day flying United!
ChgoBob