For whatever reason, I've never found the partial samples enough to give me the feel of a song or an album. Maybe iTunes does a better job selecting which 30 seconds (I haven't listened that much), but it's still not as good as listening to the whole song. Hell, if they'd distribute 56kbps mp3s, they'd be doing good. The quality there is enough for me to determine if I'd like the song, but well irritating enough for me to need to get a replacement if I like it.
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Bitt Faulk