i am using lg gsa-h22n with acard ars 2039 duplicator card. it was having some issues with lg's firmware 1.01 but acard support gave me new firmware for duplicator card to solve this problem. now no problem with my duplicator.
my dupliactor has 9 lg gsa h22n dvd writer and benq dw1640 as a reader and a seagate 80gb barracuda hdd.
i usually use moserbaer -r media with good burning results with h22n.