Well, the guide is ok, but he really didn't justify his skill choices very well. ONE point in Lightning Strike is going to 1-3 hit kill? I don't think so - especially because most people duel in Nightmare and have at least one lightning absorb item (for FoHers and Trappers).
On top of that, the charms are ridiculously inflated. Obtaining charms like that on NL now would take a wealth that I sure as hell don't posess. The same goes for the equipment. While 40/15s are duped like hell, they're still hard to get. And, I don't play with duped items anyway, so a lot of what he recommended is out of the question.
So, I'm still left asking, should I use Penetrate or not?
Threaded Mode