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I replaced my plugs at 130k miles. They were normal in color, and all were gapped within spec and within 001" of eachother.
That's pretty friggin' fantastic performance from a set of plugs, if you ask me.
I agree with the above comments - the plugs are a total pain in the ass to replace. I recommend getting an inspection mirror and a set of picks to do it - the coil boots can and probably will stick to the plugs and you're not going to be able to see in there to get them out.
The current wisdom seems to go against using anti-sieze on the plugs. I used the stuff, but I wish I hadn't, having read the comments from techs here.
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