Robe of the Void

This is a great robe and will serve you well until you can replace it with T2.5, which is the very first robe that will beat this one in terms of raw damage output. Overall, it's very much worth it.

This robe is very nice for the 46 spell damage, but you are then missing out on some nice intellect and resistances from other sets, and then missing out on certain set bonuses, if you are willing to sacrifice it.

This robe is nice for the 20 man instances and into MC, but then come BWL, the nemesis robes are much better, when they drop.

Also, this is very mat intensive. 40 felcloth is going to cost you a lot of farming and fighting others for the farming, or a lot of gold from the auction house.

The felcloth can be used to enchanced soul shard bags, like the felcloth bag and the core felcloth bag.

For a lock the nice pet heal is good. If your void is tanking (which will never happen at lvl 57) and the healer isnt healing the void just use this and yell at the healer later all is balanced :) and plus the stamina boost is good because locks drain life for mana