Originally Posted by
Wildcherry
If you're going by simcraft (which you shouldn't) the margin for error makes it irrelevant, and even ignoring that, its only about 1.2k dps. I'm sorry, but if I'm doing 300k+ on a single target fight, then "theoretically" gaining 1-2k dps really isn't worth thinking about. All content this expansion has been about mechanics, not min maxing so I can gain a >0.5% damage increase.
Imp should always be the go to pet, just for the heal it gives. You have less chance of your pet despawning due to range issues (Thok as an example). Then it has the mass dispell effect, which can save a priest something like ~15% of his mana, at a zero cost to us. The only fight I ever use observer is on Nazgrim to interupt the caster adds and for the purge effect.