Re E3 plugs...
1. Some years back David Vizard did an article on them where he talked about the design and did a dyno test vs a comparable Autolite Racing plug (which he said at the time was the best performing racing plug he'd tested). It was a NASCAR Street Stock class engine making about 400 HP and they both made within 1/2 HP of each other. I searched for this article online, but haven't been able to find it.

2. Google "AETC 2015 E3" and you can get the overview of a presentation about them.

I use Autolite Racing plugs and don't feel any need to change. However, I did find some of the above interesting.