It was a little over a year ago I made that transition, Tush, but at the time I think I noticed a a little smoother transition from cruising to acceleration when I gave it the gas.
Seems like there is less carbon residue left behind in the tail pipe, too, which could be a indication of a more complete burn.
I read about them on The TR Register Forum and ordered them from the GreenSparkPlugCo. over on the island...They come without screw on terminals, so you'll have to rob or order those.