It's very rare but for once I kinda disagree with stupid Brut, don't listen to him he's just fat with some muscle here and there. I, on the other hand, am part of the IEO, the Intellectual Elite of Oggok, and you should take my advice: not all that many parts give you AGI on SK gear and it's a shame to have to /bye on uber items to keep a slot for a crap AGI item.
For example he says you can compensate the 5 AGI with umbral legs BUT with regards to that specific example, you'd be skipping on powerfulmost orangepants from Zordak which would be a shame really, plus in uncountable PoFear runs I still have to see legs drop.. Can't take random drops for granted...
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For what it changes I think the 5 points investment is definitely worth saving yourself the headache or worse having to pass on nice gear because of those damn 5 AGI points you'll curse forever that one day.
On the other hand, I'm told that in Velious the gear will be much better so that might probably not be a problem anymore, but I'm clueless about Velious so don't take my word for it.