Read from a personal review that this burner will only read encrypted DVD's at 1X. What problems have shown up on your 3500-3520's. Anandtech.com's reviewer gave this burner his "Choice Award" for 16X DL burners because of performance + price. Can buy at Zipzoomfly for $66 (OEM) delivered but am worried if burner is problematic. Any and all comments will be greatly appreciated.