XM Radio home receivers

Has anyone compared the various Home Receivers for XM radio? If so, what were your findings?
A friend is using his car XM radio in the house with an adapter they sell. He likes it. He has a receiver based HT system, so not comparible to a high end 2 channel system.
Someone else was talking to me about this, but i can't remember who it was or the specifics. I've been told that they do have XM antennas designed for home installation, so i would imagine that XM tuners are right down the road if they aren't already here. Sean