Both Succubus and Voidwalker can be used well for crowd control or at least taking one mob out of the fight in an instace for example.

I've found that i like using VW more for this since there's normaly no failure involved. Send your VW against 1 mob (marco this so it tells the party what mob) DoT that mob and join the others against the rest of the mobs. If VW is about to die, sac him and get aggro from that mob your self. If VW dies to often and mob is humanoid - use Succubus seduce instead - the downside of this is that that mob will get no dam, you cant DoT it, seduce can fail and needs to be cast again.

So normally i chose VW tanking over Succubus Seduce.

Just my oppinoin though. Beeing demonology specced as I am may help...

No you cant name your pets as a lock, mine was called Mezzkrast, but I always refer to him affectionately as 'Blueberry'

53 Gnome Warlock
Spirestone

The Voidwalker is the best tank if you're questin, or soloin low level instances such as Shadowfang Keep or Ragefire Chasm, it takes loads of damage, but it doesn't deal much, and its spirit is ace! cos his mana and health are full after about 5 seconds after battle so he can go in again, stupid amount of mana to summon him with though.........

Voids are not useless, especially for a lower lvl lock who is all by themselves grinding/questing..it acts like a tank.. and if you get into big trouble...sacrifice has saved my arse more times than I can count...but that is my opinion.. ;)

my imp: nokjub

my voidwalker, also called a VW bus: zanggron, commonly called zanny

my succy: kalyla. too many 'l's

my felhunter: thoodym. sounds like an indian name.

imps: good for five man and raid groups that dont need other things out of it, due to the blood pact. keep it on passive, or you'll get very weird pulls. like, hakkar before the bat boss. well, not that extreme, but you get the point.

voidys: good for SOLO PvE. let it torment for 10 seconds, dot, SB. repeat. i've taken on a 57 and a 58 elite by myself, at the same time. well sort of. at level 59. <3 fear

succy: good for DPS in PvP/PvE, though that isnt what i use. also good for seduce in 5 mans that need CC and you're short a mage/preist-for-scholo-or-strat/hunter-with-wyvern-sting/rogue. AKA a last resort.

felhunter: good for debuffing enemies, particularly PvP enemies. mage vs felhunter dosnt end well. mage ends up staffing the felhunter, and the felhunter chews on the dude's boots. im sitting back in the corner, laughing. also, paranoia is good for detecting rogues before they give you anal. damn rogues. WTB bodyguard.

infernal: good for turning the tide in PvP. PvE gets sticky. if you lose control of it at a bad time, usually it ends in a \/\/ I-I I P I=

doomguard: i dont know. never tried one out. random death in the party isnt great though. you better have a backup lock to take control if you want to summon one, and he better be able to hold control for the entire fight. VS rag = \/\/ I-I I P I= hehe thats actually kind of cool

chinese slave: wait WTF warlocks get slaves? KEWL! go farm me gold! *NI HAU! NI HAU!*

I found a great use for the voidwalker if you dont mind sacrificing him.  When you need to get an item out of a murlock camp, and know you probably won't be able to take them out one by one (they are terrible!), send your VW in to attack one, and the others nearby will cling onto him as well.  He'll hold argo while you run in, get what you need, and get out!

At Level 10-11 you are able to get the quest to get a voidwalker.  One Alliance quest is called "Surena's Choker" and can be picked up in Stormwind in the Mage's Quarters in the basement of the Slaughtered Lamb.  Gakin the Darkbinder is the Quest giver.

27 demonology lock here, just wanna add my 2c.

Imp: Useful for blood pact and dps, not much else. Sometimes I put him on passive in an instance just for the stam boost, everyon'es usually happy with that.

VW: Ah, the Voidwalker. Personally my favorite pet for PvE, and a good tool for PvP. I like the fact that he can tank 1-2 mobs my level or 1 higher, because I've got improved VW. His sac shield has saved my life countless times, and can act as a wonderful trick for PvP. You have a VW out, spot some alliance, they attack, you sac void get shield and use Fel Domination to pull out a succi in 0.5 sec, so there you have a dmg shield (675 for me at 27, add that to my 1200 hp) and a succi out ready to kick ass. You'll catch a lot of people by surprise with this, and I beat a 33 lock at 26 with that tactic. My VW just happens to have 1666 health at my current level with the gear I have on.... he's an evil mofo =D

Succubus: Mmmmmm..... Heh, oh right. I like succubus for her great dps, can take down enemies fast in pve and pvp. I've had 20-24 alliance attack me and get taken out just by my succi and 1-2 dots. She is quite lacking in the health area though, she dies easily under focused assault. =(

Felhunter: I can't wait for this, I do a LOT of world PvP with a mage buddy of mine and I'd love to have a felhunter to sic on other casters, especially other locks that love to fear-whore.

Well, that's my spew for now. I guess I never really said much of anything, so I'll say now: Every pet has its own uses, the trick is knowing what to use when and how to best use it. The same goes for spells, classes, gear, etc.

Dsfargeg
<Fools of Chaos>
lv27 Demonology Warlock
Aerie Peak US

Due to a recent patch, demon trainers have been removed and now demons minions learn their own abilities.

***Warlocks no longer have to buy abilities for their pets!***

Thank You

Evisane
<Caedes Hosticus>
Human Warlock
Arthas

I just got my void and now I can't get over the fact that his name is CHARLOS! I mean, usually voidwalkers have names that look like two randomly generated parts, like "Zhar'taz" or "Grimmoth", but "Charlos"?! "CAR-LOS"?! That's AMAZING! *Hugs her Charlie.* ... And pretty hilarious.