Con: The non resistor plug may cause interference to your electronics.
From NGK="In fact, using a non-resistor plug in certain applications can actually cause the engine to suffer undesirable side effects such as an erratic idle, high-rpm misfire, engine run-on, power drop off at certain rpm levels and abnormal combustion."
http://www.ngksparkplugs.ca/tech-info-spark-plug-faq.cfm
Pro: It will burn hotter ( you will see no more than a 1 or 2% increase in performance ). When racing, when everyone is squeezing out a percentage of a percentage it makes a small difference. On a street bike I don't see the benefit.