Fairly straightforward. The description says "take 15% less damage" which makes it sound as though it's reduction, not resistance, and reduction is clearly better. I have this perk regardless, I was just wondering exactly how good it is. 15 damage resistance is not much of a gain, but reduction certainly would be!

30% reduction and +25% dmg, best perk in the game

I think it's reduction. I mean, like you say, it had better be given the way they've worded it.

If it isn't, then they should rewrite the description.

It really is the best perk. Also I bring my Dogmeat-extra 100lbs and the occasional help from him when hes not in my way. The perk works with dogmeat.

Yeah I know it works with dogmeat, but until I've heard Bethesda clarify whether this is a glitch or was intentional, I won't abuse it. But dang, that is quite something. Thanks for clarifying that, y'all

I thought it was both.

I like the perk, the 100lbs (for you and dog meat) and the extra damage resistance, and damage is great. The way it reads on my XB1 it seems 1 level gives you the damage resistance, 1 like 50lbs carry capacity, 1 501lbs more. And then the last one give you the extra damage.

I plan on getting all perks eventually so their all good for me.

My favorite perk though is the one that allows you to use AP points to move when encumbered. Once you get it where you can fast travel it is huge. I always bring so much stuff back to sell that my 4 merchants, and Trash Can Carla almost always end up capless. Even after I buy all the ammo, and junk I need (Carla's shipments are like 4k). LOL. My main is a stealth/sniper anyways so he is never in a hurry anyways. So it works fine.

It's a % reduction, if it added to your AR you'd see it in your character menu. Definitely one of the best perks in the game.