I am a frequent traveler to BOS and am a president circle with Hertz. After MANY dissapointing Hertz rentals at BOS I switched to National and as more than happy I did. I am not even exec yet but have been more than pleased at the choices I have in the regular asile. Every now and then I don't like any I see however I just stand there for a few minutes and more cars seem to show up. I will be exec after this week so looking forward to more choices.
With Hertz I rarely got a decent upgrade and the agents always looked at me like I was asking for thier first born when I wanted a different car. (Note: Hertz in other locations were fine just not BOS)