I currently have the hunter talent surefooted (3/3) which "increases the chance movement impairing effects will be resisted by 15%". I also have the surefooted boot enchant which gives "5% snare and root resistance". On top of all of this I also have an enigmatic skyfire diamond which gives "5% Snare and Root Resist" in my meta slot.

I am wondering whether they stack multiplicatively, additively or just plain don't stack.

My personal experience with this is that all of this does indeed stack in some way, but I am unsure of how much each item/talent is contributing.

Hm, I don't know, but it would certainly be interesting.
Maybe get a warrior do spamstring on you and count the resists.

I don't remember anybody did test this already.

There was no discussion about this allready.
But testing it should be simply, using an enemy fractioned warrior (or hunter) and a assigned friendly ealer to you. Let him attack you from behind 500 times with hamstring (wingclip), prase the combatlog and post the result and your conclusion.

You're inebriated.

And you don't need an enemy warrior, unless there's some sekrit anti-dueling mechanic I don't know about. You can just duel your own faction. If you're worried about taking too much damage, be a healer, or have the warrior equip a level 1 grey weapon from a vendor.

Surefooted: hunter talent. The more damage the warrior does, the more rage he gets, the more hamstrings he can do.

This is what you come back with after your week off?

Wow, some people don't take the hint.

Whenever a poster seems to have spelling/grammar problems, etc. I check the server. The poster is (EU), so I just let it slide. Come on now, I'm actually interested in this mechanic.

As am i, but i'm not going to go out of my way respeccing to survival again, getting surefooted enchant and the metagem. Therefore, i'll wait it out and check if my assumptions are proven or dismissed...

But basically, i think they either all stack additively, or the enchant and gem do anyway, with surefooted stacking multiplicatively to the sum of the two... Would be nice to see someone do the numbers, though, since i totally screw up at numbers

Equip a different pair of boots and helm - and eat the respec cost? =( We're talking a maximum of 100g here.

My uneducated guess is that they stack additively, like mount speed effects. It seems like the general trends with small % chance procs. (stun resist too)

I don't think they would be multiplactive, as using surefooted/metagem would offer a severely under-powered effect (<1%) if you have surefooted talent.

Well the difference is 0.75% between additive and multiplicative, but remember this is just for a 5% enchant. Add another 5% (surefooted talent + surefooted enchant + metagem) and you're looking at 1.79%.
And now imagine we wouldn't talking about root resists but DPS increases.

// Edit
Altough I admit testing a 1.79% variance isn't exactly easy.

JoJ doesn't snare, it just nullifies any capacity to increase your speed over 100%.

Right, but he was talking about movement impairing too. So could it not be used when he has pack on to see if it increases the amount of resists (if it can be at all) against JoJ?

EDIT: Hmm I now see that the gems and enchants don't offer any resistance to impairing effects, so I guess my point is moot. Apologies.

It stacks additively, for all of season 1 I ran Surefooted+Fleetfooted+Meta Gem, it's really great for PvP as all those snare resists turn into frost resist as well.

As a side note Judgement of Justice is not a movement impairing effect. Druids made a fuss about it not being removed by shifting a while back. We were informed that dispite the fact that the judgement's only purpose is to impair your movement it is not a "Movement Impairing Effect".

It wouldn't have been surprised if it was called a "Move speed buff impairing effect" since no player moves faster than 100% by default.

The easiest testing method would probably just be a hunter spamming rank 1 wing clip with a low damage weapon.

Unless you've found a zero damage weapon and managed to get 0 AP, I'm not sure how wing clip doing damage based on your weapon would let you use it on CC'd targets.

For the purpose of testing Rank 1 Wing Clip is only 5 damage, though.

Wing clip shouldn't be a 'damage' attack, but should break cc -> it has a small damage value that doesn't scale.

I think his main point was simply that they threw on a fixed amount of damage just to prevent using it on CC and didn't bother going any further with it. Not that scaled or unscaled would make it better or worse.

Edit: However i do use concussion shot right before trap breaks sometimes if i know i'm running against my trap cooldown. It won't break the trap

As I was about to log out today someone from these forums jumped me and asked me to help test the numbers. So we got another hunter to spam wing clip on me with all of my movement resistance stuff on. The numbers we came up with were 61 resists out of 222 wing cilps = ~27%

This is purely based on human observation of whether the wing clip debuff timer reset or not after each wing clip. The number of observations is a bit lower than I'd like but I had to go after a few tests. Still this initial test seems to show that all of these items and the talent do indeed stack additively.

Combat logs do not show resists of slowing effects. They do show resists of talent based snare effects like improved wing clip, however these were ignored for the test.

If anyone can think of a more scientific manner in which to test this please feel free do some more testing.

JoJ says right on the tooltip that it's not considered a movement impairing effect. It's why it isn't cleared when a druid shifts.

And yeah, duel a warrior and parse it.
Edit: If it doesn't show resists, you could come up with some kind of script to check if "You are affected by Hamstring" show up after "Hamstring hits you for XX" and see how many times it doesn't (i.e. is resisted).