Okay, I saw this guy on the WoW forums wondering about transferring to my realm.
He was a holy paladin like myself and so I went and looked at his gear. Puzzled at his choice for getting the four piece bonus, I asked him why he'd grab it.
Someone then told me that the four piece bonus is great and that once I get it I should be gemming all haste.
The only reason people would get 4pc is if they 1: dont know what they are doing, and 2: are on a fight where your mobility matters, so they use shock more then regularly used, but i have 819 haste.. not gemmed into it at all with the pieces i have picked up so i see no need in making my holy light go from 1.2 seconds down to .9 . shock isnt still has mana effective as other spells. so you really are adding onto the mana cost of a holy light when it isnt needed.