Instruct: Classify the given review as either positive or negative.
Query: Bought it yesterday, returning it tomorrow.

I'm new to the world of MP3 CD players, and if this is how they all work, I'm going back to straight CDs. I spent nearly an entire day trying to get a CD-R encoded to work with the darn thing. What frustration. And when I finally -did- get a CD-R burnt that worked with it, the sound quality was reminiscent of a walkie talkie. LAME. There was this weird echo effect present in the MP3 playback that does not exist when the very same CD-R is taken to a desktop PC and played there. Also, the sound quality on CDs is bad, too. FWIW, I used RealJukebox Plus to encode from CD to MP3, and then used CDRWIN to burn the MP3s to CD-R.This KOSS unit is a shame, because I bought the KOSS unit since I was so pleased with their standard CD player, which costed me [price]. This unit, at [price] from my local ... store, is not worth more than [price] IMHO. I'm returning it tomorrow and picking up either the Philips/Magnavox unit, or the RCA unit. But this one is a reject.