Very recently we booked a car from SIXT at faro airport. When we arrived we were greeted by a very friendly lady who took care of our booking. She was very professional, and efficient in sorting out our booking. We had previously booked everything online, and she didn't push any extras on us.
We very promptly received a brand new Peugeot 308 estate, which was a pleasure to drive around Portugal for 2 weeks.
On returning the car, the guy who took the car from us was polite, efficient and patient while we took out all our luggage.
Overall, I was very happy with the SIXT service at Faro airport and would not hesitate in renting a car from them again in the future.