It's been my experience that older CD players in cars and boomboxes can't always read all colors of dye substrates, and many CD player manufacturers expressly warn against using CDs with paper or other stick-on labels. My own car changer (ca. 2002) chokes on paper labels and it's always a gamble whether a home-burned CD will play well or skip--it's happened to me many times, even when using high-quality burners (whether built-in or studio-quality standalone). If you can afford to have CD-Rs printed right on the surface, the label problem disappears, but not the dye incompatibility.