I think I remember them from the 1960 JC Whitney catalog right next to the Atomizers that installed under your car's carb promising dramatic horsepower increase and many more MPG.

For small engines and the low hours they get you can't beat a traditional conventional spark plug changed at the interval the manufacturer recommends... and don't forget the AIR FILTER.

Ohh, yeah,... I got baptized on them on my old '51 ford back a few eons ago - think I ran 'em for about 20 miles before they got jerked and tossed in the trashcan. :(

We discussed this new plug design 3-4 yrs ago within the Tool shed forum . Response was cool . The pricing was outrageous at that time. I picked up a set for my lawnmower at the time White Equipt with 5.5 Briggs Quantum , also for my snowmobile since they were on sale at Canadian Tire at comparative pricing . They were still running fine after 3 seasons on both units with normal usage. I sold both units last yr and apparently they are still running fine , don't know if I would pay twice the price . I see numerous mower manufacturers offering E3 as original equipment so take it for what its worth . Normally OEM is fine with me . Perhaps others with actual experience rather than snake oil theories can assist you further.

SNAKE OIL ELIXIR !
Honestly, if these things were a panacea for all the woes that can afflict the CAFE numbers and emissions numbers....................does it not stand to reason that these would already be standard equipment when the OEMs dropped each engine into every car??
Heck, if this was really as good as the claims, they would not be able to produce enough product to keep the OEMs supplied.
Unless the magic technology does not work except in outdoor power equipment.
I am a little skeptical!! :^)

Well Mownie you skeptic, you have to remember that OPE engines are out there on the bleeding edge of technology with only the latest hi-tech design intake, combustion, and exhaust engineering providing one of the highest power to displacement output ratios in all of the internal combustion engine kingdom so even so subtle an improvement as magic spark plugs should reap huge benefits... for the manufacturer and retailers of the magic plugs.

Thanks guys.

From the little research I did, I believe the major problems with them were mostly confined to automobiles.

I didn't see any complaints when used in small engine lawn equipment. That being said, I am not convinced they are worth twice the price of Champions.

I have heard here and there that coil problems were a result on saws etc. I dunno how the electrode style itself would have an effect that. I CAN say that yes, I have had a success with an E3. One. I had an older customer w/ 28 /31" Briggs OHV with an oil ring issue. I found that the E3 would actually run longer and not fowl near as soon as the Denso or Briggs plug. I'd be a good boy and stop over and change a plug , get a basket of berries or cookies or something for my trouble mid season....