Djarum-
Just from initial use of my Arsenal Reactive, I think Power Pack gets through the heads, especially broken-down heads, slightly better than the original GOO. I haven't thrown my Rule and AR side-by-side yet, but I would say from experience that Power Pack is not quite as aggressive off of dry as GOO.
Now, this isn't to say that the AR gets through broken-down heads better than the Rule...the AR has a lower RG than the Rule, and that would make the cover want to pick up earlier than the Rule's cover and RG would. I just feel that Power Pack is somewhat similar to the original GOO...like a weaker version of it.
Sorry for the somewhat rambling response...this is something I've been thinking about for the past few days and I wanted to address it when I first saw it asked.
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Jeff Voght
PBA Eastern Region Member