I've got about a week on a lightly used MSD set that I picked up from ShoNoff's sale and re-gapped the year old plugs at .030". I'm still un-tuned at this point and it sure feels like it revs smoother and stronger. I'd have to say it was an improvement over the OEM. Also happy to see the plugs were still clean as the day I installed them. 30 years ago, reading the plugs was a required art, unless the engine has an issue now it looks like more of an afterthought.