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well i used treeants both for pve and pvp.. i gotta admit i didnt find any benefits in pve. but they are useful in pvp both against spell casters ( spell interruption ) and melee chars ( extra dps ).
i'll drop treeants to gain more treat reduction + mana regen after 2.1 but its just for raids.
as you can see on that talent build of mine i dropped celestial focus also ( very useful for pvp or solo questing/grinding/farming )..
that build is only for efficient pve'ing . ( imo )