I have an older 2003 VW, with just a CD player, FM/AM radio, and cassette.  I wanted to hook up my FiiO X1 digital music player so that I can play my WMA and FLAC lossless music files (songs) in my car.  This Maxell adapter not only works perfectly, it actually sounds great too!  I am pleasantly surprised at how full and dynamic the music sounds, essentially CD quality!  My ONLY gripe would be that the adapter itself often makes a low-level squeaky noise while it is working, which I can sometimes hear on low passages.  If Maxell fixes this issue, this adapter would easily be '5 stars'!