I got a Memorex MRX-650LE v3 and it works flawlessly.
I got it for basically free though. I never trusted Memorex CDR media so I was skeptical at first...but it does a first rate job FWIW.
I have a buddy who works closely with Apple and also beta tests a lot of the new apps, etc through his IT company and he told me that Apple basically makes their drives to last approx. 2 years before burning out and making the people purchase new drives. Similar to the way the do their battery charging cycles before they start giving you that "low Battery" indicator. I wasn't sure if I believed it at first but it seems that just about everybody I know, myself included, had their superdrives crap out between 1 1/2 - 2 year mark. Pretty shitty if that is true.