Armor penetration runes?

So I have enough IP to buy the armor pen runes, should I buy them or not? I'm only asking this cause I don't want to buy them if they aren't worth it after the update which is soon.

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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