I just had my first rental at the SJC Sixt. Excellent overall experience, with one caveat.
They greeted me upon arriving at the counter and offered me a bottle of water. I booked an XCAR and they offered me anything on the lot. The highest they have currently is a Merc GL450, I decided to just keep my car class and take an Audi A6.
The person from the desk escorted me upstairs and they had waiting, and running, the brand-new looking A6 with 1,100 miles on it. Inside were 2 more bottles of water.
In the lot appeared to be around 10-20 BMW 5 and lower series. About 10-12 various Merc SUVs (ML and GL), and around 10-15 Audi A6 and A3. During drop-off the guy there told me that had quite a few more cars coming in shortly.
The only caveat, that I consider a huge negative, is that they charge a $1499.99 deposit on the car rental. I have never seen any other normal car rental company charge such an absurd deposit. It has been 2 days since I returned the car and that deposit is still "pending" on my CC. Yes, it will drop off eventually, but annoying nonetheless.