I have the Navi system, with XM radio, but I am thinking of buying the two components required to change my radio to Sirius.

Has anyone else done this?

I like the way my radio operates and the voice recognition, so I really don't want to lose this.

Does the radio work exactly the same? Can you still change satellite radio channels with your voice?

I have to make my decision quickly, as my free XM trial ends 3/27.