I know of 2 people who gave it a go, one lasted 2 months the other 6. There are examples of (E)VPs and above who left in disgust within the first month of hire.
I talked to someone who was terminated on the spot after a year at QR. Only AFTER he was terminated they checked the reasons given by his C grade and found them to be not true. But he was still terminated... Kids in school, car to sell in a few days (!) and residence permit revoked in 2 weeks (=means have to leave the country..)