I checked the Benq website and didn't see the 1650 listed for firmware.
You probably should look better. It's on the BenQ site for sure: service & support section.
BenQ are great drives. They are also faster than NEC drives (I have the ND4551 too).
Get the DW1655 or wait a while for the new DW1670 instead. Both are great choices.
Long term lasting I don't know as I buy a new drive every year because of blazing fast development in optical storage devices and they are relatively easy to afford.