Maxell SuperDisk Quality Not?

From Dana Baggett, "I have sent my third Maxell SuperDisk back for replacement. They produce Bad Media -206 errors when using Retrospect 4.3. I sent the first two back together, as they failed at the same time about three months ago. Maxell replaced them in about a month for turnaround. I own 20 of the Maxell brand disks, an error rate of 15% to date. They were originally formatted for DOS and easily reformatted for Mac. None of my 15 Imation brand SuperDisks have failed yet. I have used SuperDisks for about two years."