Sierra Smog did the smog test fine. However, I keep my windows up since I use air conditioning. For some reason, they wanted to roll down the window which is activated by a toggle switch. They got too aggressive with the switch and broke it. This car happens to be Porsche Carrera and the switch costs $65.00. I asked told them what they did and asked politely to pay for the new switch. The told me that it wasn't their problem and denied breaking it. I will be replacing the switch, and will send them a demand letter. If they do not wish to reimburse me, I will also take them to court. I have 3 vehicles and they just lost $150 this year because of their ahole attitude! BEWARE - YOU MAY HAVE A SIMILAR EXPERIENCE!!!