E-3 plugs worth the money?

Split fire plugs were "invented" about 15 miles from where I live.

I accidentally stumbled into their shop while looking for an electrical supply house circa 1989.

The inventor was hand splitting the grounds of "blank" plugs made by Autolite.

I thought the idea had at least some merit as the spark could theoretically be more exposed to the air/fuel mix, but in reality probably simply takes the shortest path to which ever tine of the ground is closer to the electrode.

My personal experience is that Autolites tend to foul less than Champions.

No performance gains just less maintenance if your engine tends to foul plugs.