night and day difference with haste on or off (at least in my book). I can hear the difference.
There was a post somwhere, where a person timed how many swings with haste and w/o haste over 60 seconds. There was a definate increase. I dont recal exact numbers, but it was at least 15% or more. Basically, it means that all melee group members are dealing 15% (or greater) more melee damage with haste on, and that is good enough for me. Of course, I would see no reason to have it up if you were in an all-caster group
Haste only increases how often you swing though, not your special attack's re-cast time, so maybe the 15% (or whatever the # was) isnt as accurate since you still cant get any extra specials in during those 60 seconds?