All 10 CDs have functioning properly. I have actually already given up because presently unable to provide acceptable quality more all manufacturers of audio blanks. But Verbatim seems to deliver a consistent quality. Also, at the coating it can be seen that there is no waves and no farblicher shimmer is present. The CDs look like blanks are designed to look and accordingly well they work well and can also be played carefree without any problems. I hope that the high quality is maintained, even if this medium is doomed to austerben some time.