I rented a car from enterprise at the Denver airport through Kayak. We arrived at the airport location only to find that Kayak had reserved a car at a different location. I guess this happens more than we would like to think. We had to take the bus back to the airport and then a $40 shuttle to the other Enterprise location. I rented another car for April, and now that I had this experience, I checked my reservation and sure enough they did it again. So, clearly not just an accident. Enterprise said the outside sites like to be able to post the best rates, so they book you elsewhere. Be careful!