Works great.  It is excellent quality.  I use it for my mp3 player in my car, and the sound quality exceeds the ones I've used in the past.  I had a couple ones from Radio Shack before this one that didn't hold up for very long, and broke after a short while.  The problem area with other one is where the cord connects to the tape and on the other end of the cord where it connects to your audio player.  This Cassette Adapter uses a much more durable cord, which gives it better reliability and sound quality.  I have had no problems whatsoever with this unit and would recommend it to anyone.  I have a discerning ear for sound quality, and this exceeds all other units I've tried.