Elixir of Major Defense

Comparing the Elixir of Major Defense (http://www.wowhead.com/?item=22834#M0z) to the Earthen Elixir (http://www.wowhead.com/?spell=39637)

Considering the base stats of a protection warrior as follows:
15000 Armour, 11% chance to be missed, 25% block rate, 17% dodge, 17% parry, 250 block value.

Considering a boss mob (lv 73) that hits for 10,000 damage pre mitigation every 2 seconds. Sample taken is avarage of 5 runs through, each run consisting of 10,000 hits.

Default equip: Total damage taken is 20,718,964
With -20 dmg elixir: Total damage taken is ~20,610,164
With 550 ac elixir: Total damage taken is 20,432,561

Difference between -20 and 550ac is: ~177,603 damage

For a druid with default 7% chance to be missed, 30% chance to dodge, 26000 ac and the same boss, same hits etc

Default equip: Damage taken is 22,294,152
With -20dmg elixir: ~22,167,589
With 550ac elixir: 21,958,204

Difference between -20 and 550ac is: ~209,385

(Dmg with -20dmg elixir is taken as ( total damage - ( ( total damage / avarage damage ) * 20 )) so is approximate though somewhat accurate)

In all cases, Major Defense > Earthen.

This assumes physical damage only. If there is any magical damage of any kind (usual), then the numbers change. For those magical attacks, Earthen Elixir continues to decrease damage by 20 and Elixir of Major Defense does nothing.

Here's a list of 4.0.1 changes to Elixir of * Defense/Protection ...

• 
  
• Elixir of Minor Defense
  item level = 5 | req. level = -- | now = 25 armor | was = 50 armor
• 
  
• Elixir of Defense
  item level = 26 | req. level = 16 | now = 40 armor | was = 150 armor
• 
  
• Elixir of Greater Defense
  item level = 39 | req. level = 29 | now = 100 armor | was = 250 armor
• 
  
• Elixir of Superior Defense
  item level = 53 | req. level = 43 | now = 120 armor | was = 450 armor
• 
  
• Elixir of Major Defense
  item level = 69 | req. level = 55 | now = 140 armor | was = 550 armor
• 
  
• Elixir of Mighty Defense
  item level = 80 | req. level = 70 | now = 180 armor | was = +45 Defense Rating
• 
  
• Elixir of Protection
  item level = 80 | req. level = 70 | now = 220 armor | was = 800 armor
• 
  

Edit: Added Elixir of Protection