I've never really understood why people care so much about their spark plugs. The spark plug has a limited responsibility--to ignite the fuel/air mixture. Seems to me that as long as the plug does this reliably, nothing else matters. A more expensive plug will last you longer, but plugs are so easy to swap out on our hondas that you can easily replace the cheaper plugs more often than the more expensive ones and still save money. If somebody has a good argument for spending $6 instead of $3 per plug, I'd like to hear it.