it looks like they keep your keys. i have never done that. anyone think that is a issue?
I've done it in the past with other parking. All the valet services keep your keys. They also have, for an additional $10, that they bring your car to the airport when you arrive, so you can drive straight home.
I would be in. do we need to use it the same time or anytime?
You can use it like any Groupon you purchase on your own.