Every now and again we get a new "revolutionary" product on the market and none more so than spark plugs.
Looking through Demon Tweeks catalogue I saw "Pulstar" plugs. These things have a capacitor circuitry to give a greater power spark (of course) We've all heard this kind of thing before, but hey, give them the benefit of the doubt - it might actually work?

The world's most powerful spark plug from Enerpulse

Has any one tried these? What are the comments of the tuners on here, is the theory sound?
They're expensive at nearly £100 a set and the Impreza recommendation covers NGK heat range up to 7 so they should work in modded engines.

JohnD