My 2 cents: I found a nice DVD at the local library I wanted. The public hadn't treated it kindly (a kid's movie for my son). It had sticky slim covering the scratches. After a bath, it was so scratched up none of my players could read it. I have an old Compaq (don't know who made theirs) 2x reader from my Rip to DivX days, which was usually quite capable - but it couldn't make sense of the disc either.
The BenQ didn't give it a second thought - simply ran DVDShrink like it was fine.
It took about 15 - 20 minutes (I didn't time accurately) for Shrink to do it's thing - the DVD had 8Gbytes of data - fairly full.
BenQ isn't magic, but it's very good at reading. It's no speed king for ripping - I think many posts here regard some of the Lite-On readers (not cutters) as best for that - you'd have to search.