I'm using a group of 3 warlocks, 1 shadowpriest, 1 pally healer (priest is there just so I can use the dungeon finder, otherwise I would have preferred 4 warlocks + healer).
I'm using two wrathguards + a voidlord and aggro works really fine. Pally is using Holy radiance targeting the pets and it's really nice with that aoe heal effect, all three pets are healed with one spell.