I'm a bit of a technophobe but the Auro Europe site was easy to understand and operate. I also felt that I got a decent deal on my car hire in the USA.
About the service from the local car rental company - DOLLAR
The only negative observation is that the Dollar Rep at Ontario (California) Airport was a bit pushy, trying to convince me that I needed to buy "extras" regarding insurance. I suppose that this is the norm but, luckily, my American daughter-in-law was advising me. That said, the car was superb. Less than 2 months old and exactly what I had hoped for and more. The guys in the collect/drop-off areas were polite, professional and a good advert for Dollar.