That's about all there is, sorry.
Other then not having to change plugs as often you won't feel a noticeable difference.
They are better built and will last longer, but they won't give you a couple extra hp. Nothing they put on their website needs a credible source, it's just advertising at its finest.
I'm going to get a tad off topic here, but there's very little you can do to this bike that will make a noticeable amount of difference in power. Even with a full exhaust, tune, spark plugs, etc you might only gain 10-15% in power. If you want to invest in something you'll notice, brakes, suspension and tires are the way to go.
Have you used the spark plugs by the way? What is the result?I'm going to agree there isn't must to be had compared to say a 600cc R6 or R1.. in the power stacks but 15% with solid weight reduction on a small bike will be felt I assure you of that ! Couple that with your handling mods and your in customsville which is a nice place to play if that's what floats ya boat !