I had two of them, both Pioneer, purchased in 1997. Neither car had a head unit that supported a changer (a Subaru Legacy, and an Expedition). They worked very well, since we lived in a remote area with very few FM stations and there was no interference. Not sure how well they would have worked in a metropolitan area.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue