When the unit arrived, it would not allow me to download the firmware from XM to make the unit work. After phone calls and transfers to Audiovox, they decided it was a defective cable and sent out a new one. Low and behold, it was the cable. Then I had to call back because my radio was so new it wasn't on the list of firmware downloads. Again, depending on which tech I spoke with, I was either out of luck and there was no way it would work, or I was told to try a random radio code. Alas, after inputing the first radio code I tried, it worked like a champ! Great product (once you get parts that work)........poor support. My rating reflects the broken product and multiple phone calls. If I was rating the product alone after I got it to work, I'd give it a 5 out of 5. A LOT of effort to make a "plug and play" system work.