I've rented a car from Avis over 40 times in the past year and have not noticed a major benefit. The employees at my frequent location are really nice which is why I continue with them, but that's about it.
Now, I stumbled upon this thread only to find there's a preferred first status. After activating, it shows I have no rentals. IMO, customer relations is pretty pathetic. I did not even get an email of this program and probably would lose credit for my past stays.
Yes, I would probably get 9 free weekends this year, but it's rather shameful that customers have to go to another site just to find out about their loyalty program.