Just finished 28 day rental and had a great experience.

Booked XFAR and was offered an upgrade to BMW X7. Decided to stick with the X5 as didnt want something so big for parking in places like San Francisco. Car had 700 miles on the clock so basically brand new, returned it with over 3,000 miles.

Only drama was getting a screw in the tyre on Christmas day, runflats so had to take it into a shop the next day to get it plugged. Initially the Sixt call centre person wanted me to drive hundreds of miles to the nearest Sixt location to get it fixed but in the end agreed that i could get it done myself. Tire place did it for free so bought them some beers to say thanks!

Overall the Sixt experience was a lot better than when i rented previously in LAX when they were in the old location. Shuttle to the terminals was good as well, although traffic around LAX is a nightmare at the moment due to all of the roadworks and construction!