I've now utilized the Hilton at CVG 3 times to park my car. Their check-in is easy and everyone is very friendly and professional. Plus they are one of the few parking services that run vans 24/7, so if you need to go in before 4 am or come back after midnight, this is one of your best choices to park. My only issue is that they have a contract with many of the flight crews and the crews get priority over regular users. So, if the number in the flight crew is equal to or greater than the number of seats, you'll have to wait for the next shuttle which could take another 15-20 minutes. This feels very unfair to the regular user.