Less a question and more a cautionary tale... we just wrapped up a 10 day trip in the highlands, which was wonderful except for the rental car. Once again we got scammed (to my mind) by Avis with the "we don't have the car you reserved, here's a free upgrade to a big car" nonsense which of course costs more when all is said and done. Once you're at the counter and they pull this, you have little recourse when you're trying to get underway. Not the first time this has happened to us. Are we just unlucky?
Also they claimed tire damage, which was pretty bogus, but my own insurance covers it, so whatever. It did reinforce for me though that their own insurance is a waste of $. We went with a middle plan of theirs since they were handing us a quite expensive car and we were concerned. But it wasn't much good as it turns out, I was indeed fully covered by my card and own insurance, while theirs did not cover the alleged tire damages...and shame on me for not reconfirming my own coverage prior to picking up the car.
Next time I'll be more careful and will use a different company to see if any better. I've had better luck with Europcar and Sixt in the past.