I have been renting with National and enjoy their Emerald Aisle program. You pay for a midsize. You can then select any car in the Aisle. There are a combination of midsized cars and typically upgraded cars (generally larger cars or small SUV's, occasionally pickups, sometimes minivans). As an example, in Boston this week, I paid for a midsize but drove a Nissan Rogue.

I am now with a new company that has pretty good rates through Avis. I just did an Avis Preferred profile and see they have a Select & Go option. How does that work? Is it similar to the National program where I can select a larger vehicle for the same price?