All right...I've read the reviews. But, given the huge improvements to all three drives with the latest firmware, they're not all that helpful now
Boil it down: using high-quality media (TY, MCC), which drive will offer the best write quality at the media's rated speed. Speed is not really an issue.
I know the 1620 was considered the best for overall write quality for awhile, but has the Plexter caught up yet?