When I was looking for my TTRS I travelled 50 miles to view a Daytona grey at Aylesbury Audi. Car was 1 year old just over 5K miles and sounded great. So I called and the car was described as absolutely immaculate, a real credit to it's former owner. I placed an immediate deposit and headed over. Even from a distance we could see how bad it looked. Paintwork was badly swirled, very dull with evidence of some very poor quality paint correction. The inside was even worse, it was filthy, despite it being prepped, and there were scuffs and even trim damage. The car looked like it had been a pool car or something, I can't imagine any individual allowing a car to be that bad in just a year. All we kept hearing from the sales girl was that they never noticed, over and over for each item we pointed out. Most funny moment was how shocked she seemed when I said I wasn't interested in taking a test drive.
When buying the RS3 I did buy Snake's old Daytona, but swiftly discovered that car was not all it seemed! Car was sold as a "One Owner" car. The V5 arrived showing it had two previous owners. There was also some significant paint damage behind the rear number plate and a few other things that didn't seem right, so I rejected the car. Local dealer were quite embarrassed about the whole thing and, eventually, offered a very good deal on a cancelled order.
Approved Audi doesn't guarantee a great car, even though you are usually paying more for it. But it does tend to offer slightly better options should you run into problems. The Approved Audi warranty does usually come with some dealer benefit too, I've had items replaced in the past that weren't strictly covered.