Originally Posted by Boevis
For other classes, a Major Dreamless gives more returns in less time. I really can't see anyone other than a hunter or a desperate healer using the fel mana potions.
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Major Dreamless takes you out of the game for 12 seconds, though, while the fel mana pots let you keep casting. A loss of 25 spell damage isn't that bad, compared to a loss of 100% of DPS for 12 seconds; assuming -25 spell damage drops your DPS by 3%, you're looking at around 400 seconds of DPS time before the spell damage loss hurts you more than the time loss from MDS.
Fel Mana also allows you to pop it earlier, since you get it over time and are still emptying your mana pool while you regain mana, getting your timers going faster, which can be beneficial to some classes (Bekah had a nice post about the advantages of Fel Mana in the spriest thread).