As a DVD writer I’m a big fan of the BenQ 1620 and 1640 but recently I have beocme concerned about the value of the 1640 as a long term scanner. I continue to get 99% Quality scores at the time I write a DVD but scanning older DVDs ( 3 to 6 months old) shows scans still within the recognised limits but ugly nontheless. scanning the same disks on a 1640 gives much better results and scanning with a Liteon 1693S shows no problems at all.
The conclusion that I have reached is that while the BenQ1640 is an excellent writer it is not much use as a scanner. what do others think ?