I think they say the plugs are expected to last as long as normal plugs.

I don't get any carbon buildup in my engine and my oil stays clean for almost a year. Whatever plugs I use will last a very long time.

$25/plug for now. They did get quite an investment from some group so when moving more into the marketplace, I expect they could come to under $10 each in the next 1 year or so or more. Just need the volume.