Just finished a tournament last weekend with my list on page 7. Went 2-1( with the crown going to the man i lost to).
Game 1 Vs Stormcast Vangaurd
He was playing two Castellants on foot, stardrake two five man castigators and i believe 6-9 mounted dragon cav. This one i got wiped by, killed his foot soldier wall, wiffed one charge, and on his turned he mortal wounded most of my battleline away. I lost round two initiative and he mortal wounded pretty much everything off the map. Never played against stormcast, and didn't know what to expect, didn't help he turtled to start so none of his vulnerable targets took my charge.
Game 2 vs Moonclan and Squigs
This was a major victory for me. Map was Battle for the pass. Another army i never played before, was also a little intimidated by the Gigantic Squig. However i felt a little more comfortable with how i should play Slaanesh. I won initiative and charged to the first two objectives. By turned two he had one depleted goblin unit, 10 squigs, and 3 heroes left, and I was ahead 8-4 on objectives having only lost 670 poi ts to his 1170. I did have a minor blunder when i charged his grots and didn't realize he had fanatics that could pop out and hurt me prior to the charge, i payed fir it in 10 daemonettes, got go vengeance.
Game 3 VS Legions of Negash
This was a battle that favored me, as it was Duality of Death. He had a 40 skeleton block, 20 gravegaurd, 2 Morghast, 10 hexwraith, 3 spirithost, 10 hounds, 3 heroes, one was a vampire, and 3 endless spells, geminids, the scythe, and the swords. It was kind of a weird list, he took initiative and camped one objectice, and most of the other one. It took a bit but by turn 3 I had him mostly wiped, a little luck my way as he only got off the geminids.
All in all i had a good time, and was happy with my first time playing Slaanesh. I definitely made some mistakes, including poor targeting with Archaon, as i have to remind myself that he should only be hunting monsters and heroes. I also have to get better at fighting with my heroes as i was mainly sending in the nettes and not generating depravity because of it, but I will say those nettes performed amazing, hands down the best battleline ive ever had!