The big bonus IMO is that these will last a hell of a long time because, unlike platinum, there's no pressed on "tip" that will fall off over time. The entire electrode is solid Iridium, so it should stay carbon free forever.

I'm sure the fine tip electrode will provide a slightly hotter spark, but I doubt it's anything to write home about. When I got mine in there was a slight improvement, but that was probably just because my old plugs were dirty as a mofo (NGK TR6s)