Well, I have an NEC3540 and it is a superb writer.
I also have an LG4163 which is also a superb writer, though I would say the NEC has the edge.
Finally, I have a BenQ which was the best writer of all in terms of both quality and speed. However, the BenQ (my fourth) is dead, and I need a replacement... I'[m looking at the LiteOn1693, too.
I'd be interested in other's opinions; but out of the three writers I have experience with, the NEC would win.