I never bought a separate tuner for XM in the house since I get it on Directv. There is no comparison to real CD quality (redbook) due to compression and transmission quality. It is good enough for quieter listening in my bedroom, but not enough for quality listening. There are issues of compression, transmission to the sat, down from the sat and receiving by the dish. Only part of the equation is the decoding by the receiver. I say, enjoy it for what it is, but I can't see spending the money on a separate receiver unless you want to get the XM channels not available on directv.
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