Ok, let's try to keep all this info in one place. So other Warlocks have one place to look for Specs with the WWS info so you can make a decision for yourself.
Myself, I ran Naxx10 - Spider Wing last night for the first time as Felguard/Emberstorm. We had no Ele Shammy, no Boomkin, and really only one other Caster, a Frost Mage. So no real synergy going on.
Here is my Spec:
http://www.wowhead.com/?talent=IZ0xIzsgMq0sxzZVchqr0uV
Here is my WWS:
http://wowwebstats.com/imb3iuwvlljcm
For some reason, Maexxna was counted as trash. So no good data on her.