They write the quote on a piece of paper. . Then when I came back ready to buy he changed what he had included. . Charged for more parts... they made an ugly hole to put the USB cable. . Look like they just used a screw driver to break the plastic making ugly cracks. .. they didn't returned my original back up camara.. just "went missing" and they sold me another one for $200!... I had 2 cars done the same day.. bought alarm with remote start and stereos with big screen for both. .. I would not buy there again. . Parts shouldn't go missing and if they do they should pay for it... and i wish they did a more clean work. .. I've done this before at best buy and never had this problems with them... plus they shouldn't keep adding more things. .. If I ask for specific things to be done it's not my fault that the guy was forgetting to tell me about all the parts I needed to buy.. He should be the expert. This cost me about $2500 and I was not satisfied with the job.