My tapedeck adapter is made by Monster, same folks that make Monster Cable. I havent had any "real" issues yet...I do notice the payback volume will fall off a little once in a while, but other than that its been perfect for $25! I loop the cord from the tape through the pass dash grab handle and it keeps the cord away from the gear shifter!
FWIW, I got mine at the Apple store. Im suprised to hear the bad reviews about the Belkin unit, I really like their products and havent had a single issue with any of them!