Ripping speed has to do with the speed at which the drive READS a commercialy produced disk, such as a movie you bought. I'm not positive about your particular drive, but it is VERY likely that there is a hacked firmware available that REMOVES this speed-limit when using it to read the disk. This is refered to as, "Removing Riplock."
Hmmm, I decided to be extra helpful and see what I could find for you, and from what I can gather, there's no hacked FW to remove the riplock, which means if you want to back up, for example, your kids' SpongeBob videos so you don't have to worry about them scratching up the originaly, it will take a long time to READ the disk adn create an image of it that will be used to WRITE the backup copy. This will NOT, however, slow the actual WRITING part of the process at all once the image is created. Make sence?
Here is a link to the available firmwares BenQ offers at the moment:
If you head on over to the BenQ forums and ask around there which of these is best to use, you may have some luck there. Perhaps you'll decide to exchange the drive instead. Best of luck to you, and oh yeah, the BenQ forum is here: