Current Plextor drives are nothing but rebadges, but those aren't REAL Plextors. I'm talking about the classic Plextors, manufactured by Plextor, with Sony chipsets. They are all discontinued, just like the real BenQs are.
The Premium and Premium II are real Plextors. The Plextor II is only available in Japan, unless someone imports them, which they do, now and then.
Other current Plextor drives are just rebadges that you pay extra money fior, with no real benefit.
Optiarc drives are not known for being good readers or rippers. Avoid them for that purpose.