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In game terms, how good is a Slaanesh demons army? Not necessarily in comparison to the other demons / gods, but more in general terms when comparing them to other races such as marines, guard, eldar etc?

I realise an army is as good as the general that leads it, but just in broad terms, good or terrible?

My understanding is that Slaaneshi Daemons are really only a part of a 'whole', and ideally you'd want to use all the types of Daemons available to you in order to cover all of your bases. Slaaneshi Daemons are the antithesis of Nurgle Daemons: they're fast and fragile while Nurgle daemons are slow and resilient. So making an army of just Slaaneshi Daemons is (if my analogy is correct) a lot like taking an Eldar army with only one type of Aspect Warrior. That being said, if I ever made a Daemon army, it would absolutely be mono-Slaanesh. I think it's an awesome idea and would be really excellent and thematic. But to answer your question, I would say that running mono-Slaanesh would put you at a disadvantage. I think that Daemon armies are middle of the road right now, so limiting yourself to 1/4 of the available units would definitely be a handicap.

If you were interested in running an Emperor's Children or Flawless Host themed CSM army and allied it with just Slaaneshi Daemons, that might open your options and competitive potential up a bit

I run an all slaanesh army (mono god)

They can have some trouble dealing with armour for sure. The lack of shooting means you need to deep strike behind cover as well.

I use 2 soul grinders for artillery support.

it can work but i would rate it as a "specialist" army. In other words not a competitive army but one that is playable. I would not reccomend such an army for a new player at all.

Seekers are, point-for-point, one of the deadliest units in the entire game. Daemonettes aren't bad either- they just suffer from many of the issues all 6'' move melee units suffer from. Also, all Slaanesh units are really fragile, so that's something else you need to worry about.

As noted, Daemons work best as Undivided, but you can make mono-Slaanesh work. The secret pretty much lies in abusing the fact that Slaaneshi psykers all generate powers from telepathy, and you can theoretically take up to eight psykers in a single CAD. That's... alot of invisibility and psychic shrieks.

And there aren't many armies that can effectively deal with two or three invisible units of seeker blobs, which due to their DoS rules have an average move+run speed of 22'' per turn.

Slaanesh Soul Grinders are one of the best choices of Soul Grinder.

Soul Grinders themselves are perhaps the best choice for your points in the whole book.

Be'lakor isn't out of place in a Slaanesh army and he covers a lot of their weaknesses with Eternal Warrior, Armourbane and guaranteed Invisibility for a blob of 20 Daemonettes or Seekers to make them seriously effective against anything that isn't armour 13+.

Against other armies they are good.

Inside their own codex they are probably the 2nd most common/ powerful, behind tzeentch and all the summoning stuff. (that said, when summoning most people go for daemonettes).

http://bloodofkittens.com/wp-content/uploads/2014/09/12th-Overall-James-Ramsay-Nova-Open-2014.pdf

Slaanesh list above top 16 from major tourney.

To make it all slaanesh I would run something like (assume self allies for 3 hq)

Prince ml 3 with lash as one greater
Same as above
Belakor

Nettes / horrors / nurglings for 3 troop slots

Invisible steed unit with beguilement banner and herald

Slaanesh grinders with or without torrent as points allow.

The trick with the lash princes is to roll iron arm so you can shoot 2d6 str 9 shots from a flying mongrel is creature.

I think you could make top tier competitive with slaanesh alone but adding the undivided belakor and some pink horrors for the psychic phase would help a lot.

An invisible Keeper of Secrets will make most armies cry

I run mostly Slaanesh and Tzeentch combined most games, and it works really well with Slaanesh units doing most of the heavy lifting. I use Horrors mainly as ranged support and objective sitters, with a Lord of Change for arial and psychic support.

Thanks for the replies. The model that's turned my head is The Masque, is she any good in game? Her stats seem pretty meh from what I can see?

She is pretty bad, her rules could be useful/funny, but she has 2 massive drawbacks.

Firstly, she is not listed in the heralds list in the codex, meaning that if you take her then she takes up a whole HQ slot all by herself. HQ slots for daemons are highly competitive and she does not compare well to other options.

Secondly, it is easy to overlook that she doesn't have independent character special rule. This means that your 75 point T3 W2 model must run around by herself.

If you like the model you could always use it as a herald of slaanesh instead, even then though they are always better off taking a steed rather than fighting on foot.

Mono-god Daemons works if it's Nurgle or Tzeentch, Khorne and Slaanesh don't work well alone.

(It's a different story in WHFB but we're in 40k here)

Mono god armies can work, but really taking the best of all the Daemons is the way to go. For example, Slaanesh DP and Soul Grinders are amazing fast rushers due to fleet, while Nurgle Soul Grinders and Plague Bearers are good defensive units, and Khorne Flesh Hounds with a Jugger Herald are amazing due to scout and Hatred.

Really, the best army list comes from a jack of all trades approach, cherry picking the best units to work together. A mono god army is totally possible, but expect to take a lot of the best unit.