For a trade in, not bad. But it does let me know that you quite probably would get several thousand more selling it yourself to a private buyer.
If it were me? Id at least try ebay buy it now option or carsandbids.com with a strong reserve price. I was shocked how easy it was to sell my old S on Ebay last year. Sold in less than a week for MUCH higher than trade in. Funds were wired, I had ebays protection, and within 48 hours after the funds were wired, 18 wheeler picked up the car from my driveway on behalf of the seller. He left me positive feedback as did I for him. And at the time last year, my only fee was $50 or so listing fee. No commission. It was tremendously easy.
That said, reports show that the used car market is cooling off in some areas. So theres that..