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There are two different kinds of Platinum plugs available from Bosch. The really expensive ones that were made for the early 911s (which before that fouled out or eroded plugs at a horrifying rate!), and the cheapie ones that you can get everywhere.
The latter are pure crap, IMHO. The QC is spotty at best; I know more than a couple of people who have had the speck of platinum fall right out of the plug into the combustion chamber! They also foul quickly on older cars that tend to run rich. Their +4 and +2 plugs are the same crappy plugs with extra outer electrodes.
Bosch's other plugs (copper, silver, et al) are pretty good, but the cheap Platinums should be avoided.
-soD
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