You know what? It's OK.
You have to take a mini-shuttle (like...1/4 mile) from the main rental car mecca to the Sixt lot.
The service was a little slow, but it was very early in the morning when we arrived.
We got upgraded to a Chevy TRAVERSE which as an interesting vehicle. Nearly adequate for 5 bums and climbing gear.
Worth using if you have a deal.
Hard to get excited about rental car agencies.