Monk Epic Haste
 

Does monk epic haste stack with Shaman, Chanter haste spells?

No, Celestial Tranquility is spell haste.

But it stacks with worn haste. Wewt

They stack in the sense that you get the stats from the monk epic click, but the haste is spell haste, yes. So you only get the highest spell haste.

Still worth clicking it for all that attack.