Pros: We flew to Melbourne, Australia from the US, and when we walked up to the Hertz counter, there was no car for us. We had made our reservation through KAYAK. We were in their system but the address for the rental office did not exist. The woman at the counter did her best and found a business downtown that could provide a car, but for $1000 more than what we had reserved. Not impressed with KAYAK. Thanks to Hertz, though, who managed to work something out with no notice.