I've burned a few ESBuy generic DVDs with only 1 issue of my Sony DVD player not recognizing the disk. The Sony did recognize other ESBuy disks, so I'm guessing their disk quality is marginal. I'm interested in buying more disks (25 to 50 pack). I have a G4 Mac with a DVR104 drive with 1.33 firmware. I've read a bunch of postings and it sounds like the two best types of low cost DVD-Rs are Princo and Ritek. Which do you prefer? If you have used either have you had any problems with 1X or 2X DVD burns?