Planned on renting a Mini for my week at CES 2016 and got to the office early, via the rental shuttle from the airport and a secondary Sixt shuttle. They're located across the street from the consolidated rental building, and one could even walk it if they so chose.
They didn't have a Mini for me and I wanted something nice for the week, and I was given the option for a nice upgrade at a really good deal for a Mercedes c300. Sold.
Car has been great, the agent at the counter was also very helpful. The mobile app is pretty good as well. Will definitely use Sixt again.