I have been a Preferred member for a long time. And rent about 30 times a year - but never heard about Select status. I read about Select on this site and called Avis. They said, "You should have been Select long ago. We will send you out a card right away." I inquired about Presidents card and they said someone would call to discuss. I did get a call, but need to call back as not in office at the time.
Not sure if Select will help me on upgrades. I get them about 50% of the time anyway.