i ran gosac demo with 18k+ haste the past few weeks of tot and my uvls went off like a firecracker (put up an r3 on megaera hc with this setup) our spriest was also over 18k haste and his was proccing all the time, as opposed to when i dropped to the more 'normal' levels of haste sub 15k didnt even want to play my lock anymore, it was like being coated in acidic goo the mantids in towlong steppes put on you, everything so slow.
mor on topic i dont see the nerf to hellfire/immolate aura changing anything for demo.