I really don´t like SCs. Thats so, since my early days in fantasy. We never played them much and most times they are too over the top. Nowadays, when I took a look at tournament GK-Listes, geuss who´s showing up: The cheaply underpriced and overused coatez - this is the most hated of special chars, he is so broken, like the codex hes out of. Since GK spams the tournaments its no fun to play these. But i am drifting of...
SCs are too definied an mostly the are fluffwise to "big" to be on a battlefiled with a handfull of points. Abi should leading a 3K force minimum. For example.
The only SCs I like to use are: Lucius - it is very rarley, that i play him though i like his rules, his story und EC/Slaanesh in general. He little bit overpriced compared to his buddys.
Sometimes I play Marbo but I don´t see him as a SC.
Since Choas has only a 1/6 Chance of infiltrate (yes they stole infiltrate from chaos, look back. In the last codex we have the choosen and in the holy book before that crap of codex you a have the freedom of choice and could infiltrate a whole army (AL)) I plan to use a IW Chars with the rules of Huron. Not that he will allow you to infiltrate, no he has perceft stats for a IW hero (armourbane) and a bonus, he can make a little bit of sorcerey - come on, how to do you get that with a normal lord for 160 pts?
But I still don´t like SCs.