I bought one of these a 2-3 weeks ago the actual I/O model is IDVD16DLS and it is a BenQ DW1655. There are several other threads/posts in the BenQ drive forum about these. Also, just flashed the firmware to the updated BenQ version to make it a “real” BenQ.
The one I bought had been opened so I was able to verify the actual model first. This also means that someone did not want the BenQ
Also from other BenQ threads, some of the CompUSA drives that say
“mfg. DW1640” are just that…a BenQ 1640. But they are about $80 and only have a 90 day warranty.
hope that helped.