In my experience with many types of CD and DVD burners, I find all the recent ones (last 3 years) pretty good, but for longer lasting CDs I still drop burn speed down to 4X or 8X as although 52X is fine for short term, the burn doesn't appear to last as long (might be technically incorrect, but that is the symptom)
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock