I bought an used A4 from Amin, the experience was pleasurable. I also received excellent after care service from Adamo from the service department. Soon after I purchased the used A4, I started to notice the car had unusual howling noise and vibration going at high speed, even though the guys couldn't quite figure it out at first but they were patient with me, agreed to test drive the car again, and eventually replaced the wheel bearing. The warranty and appearance protection plan were well worth it as Audi honored their coverage worry free.