This is the 4th version of these adapters I've tried and none of the others sounded this good. (Sorry I don't have the names of those to avoid, but the last one was bought at Radio Shack) All of the others made considerable clicking/grinding noises as they turned inside the deck. This unit operates much quieter as well as transmits the sound MUCH better. one of the others I tried gave me the trouble swithching sides endlessly back & forth in auto-reverse decks like described in other reviews here. I've not needed to make any modification to this model- it just worked as expected with great sound quality. The coiled cord is nice, and the notch on the end for the cord to bend neatly as it comes out of the deck helps this one feed in completely without getting stuck or triggering the auto eject. I've never bothered to review anything, and this is not an expensive item. But having tried 3 others with such disapointing results I felt others should know this one is at least among the best. I got two more for my wife and daughter, and both experienced the same improvements in thier cars as well.3 thumbs up!