Same thing: user reviews on a retailer's web site.
You often see a lot of negatives on retailers' sites. Take a look at reviews for popular hard drives; it's bad. But it's sort of the norm to see some complaints. As of yet, I haven't heard of an epidemic where any optical drive in recent years fails prematurely (except with certain users who have bad luck or have some environmental factor causing their issues).
But overall, the BH14/BH16 drives on Newegg have around a 4 out of 5 score when I look at them. That's...not that bad for devices that have been available for some time.