I'm loving being a Shadow Priest, even though being a healer is my calling.
In 5-mans (regular) I run into mana problems due to not really having the time on trash to get a VT/MB combo going in time to proc Replenishment. In heroics, the only time I run into mana problems (if you can call it that) is on bosses. And it's only a problem if you consider finishing a boss at 13.5k mana left out of 17.6k a problem.
I will miss the mana regen on Dispersion, though.
As for Mind Sear ...
With a 5 stack of Shadow Weaving (which will happen within one mind sear, if not before), I'm hitting ~1250 per mob per tick with crits for 2500. Higher if my trinkets proc. Once you get used to it's idiosyncrasies, it's lovely. Just VT/VE/SWP/DP (if you want to waste the 4th GCD) and MB the target and MS the rest of the group down. Doing that, I can take groups of 6 or 7 at a time and the target dies at the same time as the other 5 or 6.
Very nice spell. I've made a couple mages jealous with it.
[Edit: Sometimes, English > me. I really dislike having CRS some ... what was I saying?
-- ed.]
Edited, Mar 12th 2009 3:06pm by Shamandin