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I read through this thread recently doing some research and I just thought I'd share my experience like many others have in this thread in case anyone might find it useful.
I just changed my plugs out at 53k miles for OEM replacements. The old plugs looked pretty decent, no major wear, but the car does run notably smoother and quieter with the new plugs. There had been a rather significant shudder at a certain RPM when revving in neutral before which is now almost gone. I think people forget that aside from physical wear and buildup on the portion of the plug exposed to combustion, the plugs ability to efficiently conduct the current does deteriorate over time. My car has been driven hard and while it did still run well and strong with good MPG, the new plugs have definitely made an improvement.
I was able to do this job with no special tools and without lifting the engine as well. It is certainly necessary to have a good versatile magnet though.
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