If you have no other forms of haste and the .3% is just going to put you at the 256/1024 gear cap then it won't make that much a difference. If that .3% is putting you from 770/1024 to 800/1024 then you bet your ass it's better. Increasing returns, etc.
Obviously if you're hitting haste cap without capping gear haste then the point is moot...And if your Brd has a +3 Harp or a Gjallarhorn, forget it you definitely don't need capped gear haste to cap delay reduction.
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