As long as you are going with a reputable pulley manufacturer who understands how to build a perfectly balanced pulley, there have been zero problems. We've been producing pulleys for superchargers on down for years, and have never had a failure.
There are thousands and thousands of pulley sets being run on 350Z's, G35's, G37's and now 370Z with no problems at all. The factory crank pulley does NOT have a harmonic balancer, the engines are internally balanced.
Again, this is not the type of item you want to take a risk on ebay by just anyone who thinks they can cut a pulley, but have been a proven power-adding modification that provides great results.
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