I have not dealt with them myself, so can't really say, and each person's experience differs from another - a friend of mine some years ago bought and took his Mini Cooper S to them for servicing and also for the Works conversion. Apparently there was some stuff-up with the factory conversion which caused damage to the supercharger. Then he had issues with alignment problems, more a case of RFT issues.
But, as I said, this was over 5 years ago and not necessarily a true indication of the service itself.
For what it's worth, my car's entire service history prior to me purchasing it was with Auric, and the car is still running perfectly...