Im personally thinking this would be pretty sick. I know felguards can be pretty nasty and w/ Demo build your felguard is gunna have

5% crit increase
30% damage increase
15% damage reduction
35 to all resistances
15% More Sta
3% More Health


To top that off, each global cooldown ur gunna drop 4xDoTs (Corr, possibly Immo, and CoA) not to mention having 4 simotaneous drains on a single target.

I also wonder if Soul Siphon will almost be an automatic 32% from corruption and CoA it reads,

Increases the amount drained by your Drain Life spell by an additional 4% for each affliction effect on the target, up to a maximum of 60% additional effect.

But it doesnt specify wether the effect needs to have been casted by the warlock himself or other affliction effects apply. I also think 4 felguards would be pretty damn intimidating. Nothing like insta gibbing some poor noob questing in like nagrand and you would sick 4 felguards and /lol


edit: with this in mind imma hop on and see if I can steal the guild name Entourage LOL