Pretty significant DPS increase. No point to run Unleased Power because IF there are adds, they die too fast to Chaos Nova and therefore it’s a waste. I do roughly 3-4K more damage in boss encounters with Fel Eruption than without it.
thats definetly not true.
despite the fact u will loose a global cooldown for even more important abilities, all reliable sims show that its even more a weak decrease than an increase of ur dps.