Executioner

Please don't pollute wowhead with garbage like that. You can clearly look at the spell details here: http://www.wowhead.com/?spell=42976 which very very clear states a 15 second buff. I'll leave the theorycrafting to people better at math, but seriously, click a couple links before you comment =(

edit : This comment was addressed to a comment which has since been deleted. I'm not responding to Shadowreunion. I have Executioner on my Torch of the damned and my general assessment is it's a nice pvp enchant / raiding enchant, but kinda sucks for farming. I'm a paladin, though.

I want to talk a little bit for PvP.Savagery or Executioner(Savagery vs Executioner).With Savagery you get + 17.5-17.5dmg(as warrior) and about Executioner dmg depends whats the armor of your target.

Savagery:
For Example with my warrior in full Arena S2 gear on PvP MS build has 1734 AP(Unbuffed) with Savagery enchant on me, thats like ~1.009% constant increase of my dmg and As much AP you have the savagery gives you less % of damage for example with 2000 AP Savagery boost you ~0.875% of your whole dmg.That means as much AP you got less % of DMG boost.(Dont understand me wrong savagery always buff 17.5-17.5 +dmg increase if you are warrior but the % of dmg which I'm talking about is different with different AP)

Executioner:
The % of damage depends of the target that you attack.We can see what + % We get from Coconuter's calculations(which I get for correct) : http://spreadsheets.google.com/pub?key=p-p2GoLIggc7xJFZegWVhDA

The example with class-armor is very good and real because most the classes with full arena gear have almost ~the exact armor as the Coconuter's scale has.And if you fight target with 10k Armor for example 2H Warrior with Full Arena Gear the dmg increase is around 4% +damage.And Even If you fight Druid on Bear with 25k Armor(which is too much, usually resto druid in arena has like 16-17k on bear with the tallent Thick Hide who gave you +10% armor increase) the +% dmg boost is not less than 2% which is still more than Savagery.
On cloth user like Arena Geared Mage who has around 2500 with Armor buff and around 1700-1800 armor with no buffs the % of dmg Increase is lik 7-8% which is very good.

I dont really know whats the proc of the Executioner enchant, 15 secs is a good time and if the proc is good it worth to change your Savagery, since you are not so much Crowd Controlled and able to use the full time of your proc(or atleast 70% of the time).I am gonna definitely try the Executioner and If the proc is good I think it will be better than Savagery.

p.s.On different builds there can be some differences between the % Increase of Savagery but imo they wont be so big.And I am sorry about that I didnt write comment about other classes but you just can calculate what % of dmg increases Savagery on your class and then to compare it with the Coconut's ignore armor scale.And I am sorry that I didnt write a comment about the Moongoose but the % of dmg increase from this enchant depends a lot from your build(if we are talking about warrior) and the resilience of your target.I am sry in advance if you find some mistakes in my post it was too early in morning when i've wrote it(I've just tryed to help myself and to share my point of view with you) and I hope it will be usefull for you.And maybe sometimes I am gonna wright something about the Moongoose enchant buff on different warrior builds and targets.The choice is yours what enchant to use and what you prefere-proc(Executioner) or constant damage(Savagery) and are you so much crowd controlled(with the setup you play) so you wont be able to use the Executioner’s proc properly.

EDIT:After Test
I've tested the proc.And now I can give you exampl : In EotS Battleground I was zerging with heals and 90% of the time I was with the proc, It seems that it trigger on multiple targets I mean if you do Cleave+Whirlwind the proc chance is increased.And In arena I am very satisfied with it. And bensam I dont know how 5 minutes it didnt proc really its imposible that can happen only if you zerg and die in 1-2 secs.I personaly use S3 mace 3.6 speed and as I mention I am pretty much satisfied I dont know about these Five minutes I've tested also the proc rate outside of IF, only with Auto Attacks and it procs very good.Still i am pretty much convused about the "FIVE MINUTES". :) But everyone has personal opinion and If you dont like it put Savagery or other enchant. :)

What? Procs Per Minute is an AVERAGED figure, not a fixed maximum >_< You could have an enchant with a PPM of 0.1 (i.e 1 proc per 10 minutes on average), and still with incredible luck have it proc 3 times in 3 swings. Afterall - the chance of any given person winning a lottery is miniscule - lets say 0.00000001 Wins Per Ticket. Yet someone still wins it, and in some rare occasions even win 2 ;)