I call it BS. Also, the site does not indicate how much fuel it saves, and you can guess why. Also, producing a spark has little to do with wattage. Ever remember taking a sweater off in the dark room and all the sparks from static flying between your head and the sweater? Those sweater sparks probably required all of 0.0001 Watt of electricity. LOL.
Also, a normally working regular spark plug is pretty effective, there isn't much that can be improved.
And even if all of 50 Watt is being saved, it's such a miniscule amount of power compared to the bike's/car power... To put it in perspective, 1 HP = approx 750 Watt, so 50 Watt is pretty much nothing.
Now, that we discussed this, I read about blinker fluid which really makes a difference. Let me know if you are interested.
Oh yeah, the website quotes a guy who installed them on '91 Nissan and his mileage got 10% better. That Nissan probably had original spark plugs which were so good they only got marginally bad after more than 15 years. How about comparing the BS plugs to a '08 model plugs?