Originally Posted by Pulsation
As you probably will now, ArPen gets better the more you have of it so the last few ArPen points really can make a difference. The 180 AP on the other hand i find useless and by comparing it by just multiplying it isn't really a good comparison don't you think ?
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Actually, just mulitplying is a good comparison. I guess you didn't read everything I posted, Armor Penetration is
never (bolded for emphasis) worth 4x as much as AP at this stage of gearing. This isn't a number I made up, this is based on FbN, Rawr, and Toskks. Mind you, I said "at this stage" meaning that in theory, at some level of gear, ArP does become greater than 4xAP, this happens around 12750 unbuffed AP with 61% crit (buffed) and Hit/Expertise capped and just under the ArP soft cap with a Mjolnir/DMG. With Comet's Trail/Dark Matter, and getting within 45 of the hard cap of ArP, the requirement drops to 9200 AP unbuffed and 59% crit. Still, pretty unreachable until maybe Icecrown.
As pointed out by Halmmar, AP still scales with your current ArP, Crit, Hit, Exp ... everything scales with everything else, just because it's only a 2% increase in AP, doesn't make it any less useful than other stats when it's given is such a large amount (remember, we spec into talents that give less than that)