Pros: I rarely rent from Sixt since they came up expensive usually, but I had this great offer and it was not listed as Sixt but rather FLIZZR. The car war new and clean, No issues with picking up the car, very helpful customer service as I had experienced in former encounters with Sixt. Also the customer service representative hinted clearly on all and any pre-conditions (scratches, small dents), which I would have never been able to detect, since the rental place at the Cologne airport is rather a dark parking garage. I was even able to get an automatic for a small additional charge ($5 a day).
Cons: The car, an Opel (Vauxhaul or General Motors), was supposed to be an automatic, but felt like a hybrid manual and had a very strange way to shift. Didn't shift smoothly, but I was stagnantly shifting, at least I did not have to shift manually.