I know everyone is adamant about it.
Just for the record, I stick with the OEM plug.
My engine runs smoothly, no hickups. It starts under every condition alla prima. First plug served 23000kms before showing signs of age, and is duly replaced with a younger brother. It too performs flawlessly.
I mentioned I ran a test for 1000kms with the BRP6ES plug. I was apalled by its condition. It came out overly dirty.
It was a relief having faithful back in.
My small poll came to this preliminary conclusion: unless you are subject to fuel contaminated with ethanol and having poor results from the plug a NGK one can bring relief to the problem.
Sjeesh. There was a time when one had to move to a third world country to have questionable fuel.