I am running two PX-716SA's connected to my ASUS P4P800-E Deluxe motherboard. Over the years, I have had many Plextor products, starting with a Plextor SCSI CD-ROM in 1964. Without a doubt the Plextor PX-716SA's are the best Plextor has ever offered.
I am using No Name 8X DVD-R media, and both Roxio and CloneDVD 2 offer to burn at 16X and 2.4X DVD+R Dual Layer media at 2.4X and 4X. Although I have burned at all the speeds offered, I almost always burn DVD-R's at 4X and Dual Layer DVD+R's at 2.4X.
The bottom line, I don't remember when I last burned a coaster. The blank 8X DVD-R media that I am using are High-Speed DVD-R (DVDR) 8X 4.7GB White Inkjet Hub Printable Blank DVD Media, that only cost me 24 cents each.
BTW: dvd identifier identifies these discs as: Taiyo Yuden TYG02 which I'm told are about the best you can buy.