decent quality, works fine, just like PIE claims. Don't have to destroy the dashboard just to listen to my mp3 player. Sound quality is perfect, which you certainly can't say about those FM transmitters.
probably can't be helped without a signal booster, but mp3 players on my 2004 civic require putting the volume at maximum, and then it's still not loud enough to hear clearly. i have to increase the gain on my mp3s to get sufficient sound.
would buy again because it seems to be the only thing that works, but i sure wish it was louder. I drain my mp3 player batteries very quickly because it's always on maximum.