The advantage is that the car will be properly repaired to Volkswagen retail standards and therefore won't lose its body warranty, and can be part exchanged at a Volkswagen dealer without serious penalty in the future. The disadvantage is that nothing is for nothing. And if Volkswagen has contracted with an accident management specialist to provide this service, then that specialist will earn its money by putting crash victims into expensive 'credit hire' cars for the duration of the repair, which may be extended to make more money from the hire. If the insurers refuse to pay, the crash victim becomes liable for the credit hire and I have heard of bills as high as £70,000 (while an Aston Martin was being repaired). £10,000 during the repair of a BMW is not unusual.