Worlock viable for PvE-Boxing?

[Grobi]

Hello,

i want to start a new PvE-Team.
I think i will use a pala tank and a pala or disc as healer.

I want to add 3 range DD.I like the warlock playstyle. So i consider to add 3 warlocks to my team.
Is warlock viable at the moment or is it too complicated to box them? Wich spec is box-friendly? Destruction?
Has anyone successfully boxed a team with affliction-warlocks?

What do you think about my team? Will i get problems in heroics?

Lot of questions

Thanks for help!