Since you shelled out the cash and got ripped off already, you might as well keep the bosch rip-off plugs in there(if your motor is mostly stock) and chalk it up to a lesson learned and buy the cheap plugs next time.
some thoughts on other comments-
platinum does conduct more poorly than copper, thus the weaker spark.
This would lead one to believe that it is not more reliable at lower voltage.
And to the best of my knowledge, platinum retains heat more than copper, which keeps combustion chamber temps. higher (can be bad for performance generally speaking, depending on your application)
Platinum is used for long life only, right? Maybe less likely to miss after 100,000 miles, but when new, not a concern.
these platinum plugs are all part of the new car 100,000 tune up schedule, are great for hard to reach installs, but generally worse for performnace.
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