We've burnt 1000+ on those General CD's from Corporate Consumables, .68c each, on 4 different types of burners (plextor, pioneer cdr/dvd, yamaha, and teac) and had probably less than 10 failures in burning. HOWEVER, one or two of our clients have had issues with extracting audio from them (this may have been reader related!)
Excellent article on "How Permanent is CD-R Media? Understanding CD-R's Variables" here: http://www.medialinenews.com/issues/2001/news/0314/0314.1.shtml
