Should I change LG GSA4167B for BenQ?

I had a Benq dw1640 that worked beautifully...........for 3 days!!
Then just sat there flashing its little led at me and nothing else.
Returned for refund and now have a beautiful LG GSA-H10A dvd-ram burner.
I know there was a bad batch of DW1640 burners I think from memory were made between august2004 and march2005.Mine was made in feb 2005.
This new LG burns everything perfectly no coasters and everything burnt at max speed(havent burnt dvd-ram yet but would assume the same would hold true).