I wanted to post I bought the BlitzSafe HON/AUX DMX V.2X adapter and installed it in my 2007 HondaAccord V6 6-Speed EX-L. And so far so good, no ground loop problems, nice clean sound and my XM still works. So I have the 6 disc, XM, and Aux working fine.
My one gripe is that it takes a few seconds for the Blitz to kick on which when waiting for music is too long. My last deck was a JVC that had an aux input adapter and it worked as soon as you clicked over to it. But thats it, only one gripe.