Hehe. I can see the ads now. "Try our new 50X 3.5 inch floppies!"
A while back I went through about 12 floppy drives on my machine because they all kept failing. I eventually tracked it down to a double density disk that was somehow destroying the drives (!). Any way, I tried just about every brand there is, from brand names to generic junk, and during the time they worked (prior to inserting the drive destroyer) they all seemed to perform about the same.