It seems to work reasonably well with burns on my Plextor PX-712, but I have seen BenQ scans posted of discs burned in Plextor PX-755/760 and they look ugly with jitter above 12%.
There's an ongoing discussion about whether BenQ drives can accurately scan DVDs burned in non-BenQ drives. No definitive judgement has been reached yet.
Personally I think there is much circumstantial evidence indicating that BenQ scans of DVDs burned in some other drives (LG, LiteOn, NEC, Plextor) are not trustworthy.
El_Nino's disc didn't just show a poor quality scan in the BenQ drive, but actually failed a Read Transfer test! This doesn't necessarily mean that the disc is unreadable at a lower speed or in another drive, but it certainly isn't a good sign.
This indicates to me, that either the disc or El_Nino's BenQ 1655 drive is problematic.
El_Nino, do you get good scans in your BenQ drive when you scan discs burned in that same drive?