I use my Rio Karma for listening to MP3/OGG/FLAC. It means I'm not excessivly draining the battery of my 505. Also my Rio Karma has a really nice learther case tat clips onto my belt. So it doesn't get in the way. I prefer to have more battery life for my 505 dfor reading. Also, my Rio Karma sounds a lot better then my 505. The 505 is just OK at best.
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