I ended up paying a garage to get the car started as the process with Avis failed badly.

Very good

We were given a complimentary upgrade and the car and the process all worked very well. Because I'm AVIS preferred I could skip the incredibly long queue in the main booking hall and go straight to the preferred desk. If I wasn't I think I would have waited over half an hour to get to the front of the queue (which we stood in first before seeing the sign to AVIS preferred)

All worked vey well and when I had a support query it came back quickly with an answer

The reception staff were very friendly, but not very familiar with the QEEQ rental voucher. Due to a flight change, we arrived an hour earlier than our scheduled pick-up time, and the quoted price was significantly higher than our reservation price. After we pointed this out, they explained it was because we arrived early, and then they corrected it. During this trip to the US and Canada, we rented cars three times, and twice with AVIS, arriving slightly earlier than the reservation each time, and encountered the same situation. The US is a trust-based society. For both pick-up and drop-off, no one checks the car condition, which takes some getting used to, but this mutual trust feels great.

The pick up was slow, 25 minutes, despite there only being 3 people ahead of me in the queue, but at least it was in the terminal.

Booking worked well and the price drop guarantee worked with a reduction on the original price.