im trying a 5 lock team atm, currently only lvl72. feels a little twitchy at times in wotlk instances, but crappy gear and incomplete talent build dont help.
I have found felgaurds the best pets all round for instances, cleave seems to do a much better job at gathering aggro than the void ae taunts, plus the damage of the fg's is quite impressive and they seem to bounce aggro around between them nicely, works well most times, but they do go down if they remain the focus of several elite mobs at once. If youre feeling lazy then they can dismantle a group of elites on thier own fairly fast with healthfunnel keeping them alive and no offensive spells from the locks. On harder stuff its worth running 1 void for the 13% hit debuff from the ae taunt.
Its a fun group anyway, lots of potential, the real challenge will be heroics and the icc5 stuff, cant wait