Things must have changed in recent years. This is not a good shop. They say all the things you want to hear when they are selling you their services but the work in poor and customer service terrible.
I choose them to install a Kenwood 6990HD unit with Sirius and Navigation because they said they could make the steering wheel controls work for my Mercedes. 15 hours of playing in the dash and several calls to the factory, my dash had a gaping hole and wire problems. I let them finish installing the radio because it was all spaghetti.
The radio navigation hard drive crashed, probably due to the installation issues. They removed the radio and said it would be sent to the Kenwood repair facility and back in a few days. Three weeks later I learned that Kenwood had never received it. Sound Decision had no tracking number. They tried to upsell me to a newer unit.
I told them I didn't want to be upsold, I wanted my radio returned. After complaint calls to them, their distributor and Kenwood, I was told to go the store to get my radio.
Kevin, at Sound Decision, handed me a plain brown cardboard box that contained parts from a different radio. He refused to reinstall it. The connections do not match up so now I need to find another installer.
Avoid Sound Decision.