Until now I've used a crossflashed LiteOn 401S@811S to burn DVDs. (I've always been a huge LiteOn fan from the CD days). The quality scans were OK (PImax always < 150 and PIFmax always < 4) but the excellent result from BenQ 1620 owners convinced me to move on to BenQ 1620.
Today I got my drive and I'm so happy right now. My first scan is very good (The media came from a bad batch of MCC002 media (same spindel))
A new happy BenQ 1620 owner