It is not clear which media you are referring to but the Ritek 4X +R 100 stack from newegg is either the R03 back when it was having problems with good 8X burns or it is the Ricoh. I ordered a few and never got the Ricoh, only the R03 which burned fine on my 3500 but not on many other drives. There really is no difference between this and the 8X, just the label. The Ricoh is better but don't count on getting it.
At least the rebate from Verbatim works most of the time. Mine is in process and valid so I have passed the first hurdle.