It is extremely devastating.

I actually found I never had time to mana burn unless I felt like being an asshole and having a laugh at people. At 70, Mana Burn will take half a fully geared Season2/3 pally/priests mana in one cast round of it, two and there pretty much about out of mana.

With two rounds of it, most people are at about half health. In that 4 seconds I could have probably killed them.

Actually if taking SW damage bothers you - just make sure Prayer Of Mending is up, the damage you take will proc prayer of mending and make it bounce all over your party - and if a mage jumps in the middle of you and aoe's everyones prayer of mending procs and goes crazy and mage is OOM and your on full health.

My biggest issues are:
Need massive amounts of water, goes OOM very fast.
Zero AOE capability, when 3 melee get in your face, AoE Fear isn't always the answer - sometimes single target DPS is not enough.

Chain Lightening shits all over our nukes as they hit 3 targets can be garuanteed to crit etc.

Its a very viable team and looks sexy as hell, but just be aware of these limitations. VE is awesome, VT is extremely situational and not viable in PvP at all.

-Slats