The Benq1620 is a rip in the space-time continuum. Avoid it at all costs. Getting a good one is hit & miss. Benq had serious quality contol issues.
I'm embarassed to have purchased it, even if it was just to provide a comparison with my existing NEC3500. My eyes have certainly been opened concerning the naivety of people & their acceptance of serious flaws as being the status quo.
The current crop of burners all get good reviews, including the benq1640, the nec3540 & the LG4163 (which is based on a phillips HS drive).
I was relatively impressed with the NEC3500 & NEC 3520, and the LG4163.
The LG can't do quality scans though, if that's a drawback.