Vais Tech integrates XM satellite radios, not Sirius. I contacted them sveral months ago and they said they would announce something soon. I don't know what their definiition of soon means.
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I bought my GS3 last September and it came with Sirius already installed....using an FM Modulator. I am going to rip it out soon and put an aftermarket headunit in there. The way it is installed is through a small hole in the middle console. I dont know who did it, but it looks ok, but it is a pain in the butt to open up the console all the time OR to leave it out. I just think it could have been done better.