Went 4-1 this weekend with Skyborne Slayers at a local GT (NOT THE WARHAMMER WORLD FINALS):
Lord-Celestant (Mirrorshield, Staunch Defenders)
Raptors with Longstrikes
Prosecutors with Javelins
Major Win against Kharadron Overlords with lots of Endrinriggers in Battle for the Pass. Spread out what was on the board, then dropped, cut down 2 of the 3 Endrinrigger units, blew up the ship, and controlled a lot of the board. If I didn't get the double I think it would have been closer since those balloon boys are seriously powerful, but I managed to whittle down most of the army before he got to do much with it.
Major Loss against Tzeentch on Duality of Death. Extremely hard matchup + mission that favors him more. He had 2 units of 6 Enlightened that just cut through my entire army and I didn't get the double on my drop turn. I also messed up placing my Lord Celestant, letting him get blasted by MWs and then not having Heroes to score. Was nearly tabled by T4 but it was a fun game, learned a decent amount about my positioning and how to play against his type of army.
Major Win against Ironjawz on Starstrike. He messed up by moving all of his units forward and leaving his Heroes in the backfield open. I instagibbed his Mawkrusha and a couple of the foot dudes, then got the double and cut down everything else. His Brutes and Ardboyz were able to fight pretty effectively by themselves but I had the points and the numbers so we called it.
Minor Win against Nighthaunt on Knife to the Heart. Always hard to get a Major here. He started both Mournguls off the board and then only brought one in on T1, I dropped in, killed all the characters, and the other one was stuck off the board. Then it was just attempting to whittle down his troops in order to get to his objective, but 4+ ignore Rend is too good. Won on Kill Points handily, though.
Minor Win against Sylvaneth on Scorched Earth. Crazy game. I gave him first and he teleported units around, burning one of my tokens for 3 points immediately. I dropped in, killed his wall of Dryads and his Wizard, then the double let me drop his Treelord Ancient on T2. I opted to burn both of the tokens on his side on T1 but only got 1 point, if I had left them it would have been better. First time playing that mission! By T4 he basically only had Drycha and some Hunters on the board, which he used to teleport around to points. He burned a second of mine for 3 points again, so even though he was nearly tabled, he was up on points on T5. I captured his last point and burned it for 2, tying us on VP but winning on KP. I made some tactical errors but so did he, balanced out a bit in the end.
Longstrikes at min unit size are pretty good for their points but aren't reliable as a removal unit. Totally controlled space though, locking down backfield objectives and then plinking off wounds from priority targets. 9 in an Aetherstrike removes units per turn, 3 will sometimes finish off that Kurnoth Hunter that's giving problems. Not sure they're an auto-include but not bad for the points.
Aetherwings were worth the points every game. All stars if you're bringing Raptors.
Prosecutors in theory are awesome but somehow I think they only did like 6 wounds all tournament because they can't make a 3+/3+ attack to save their lives when I roll them. Bleh.
Venator does his thing and snipes a squishy Hero every single game and then moves around chipping off wounds. Always take.
Battalion is still quite good but definitely has weaknesses to mobility. It's nice to drop Starsouls right where you need them, but once they kill the one thing you send them into they rarely reach anything else with the pitiful 4" move. Really need to tie up multiple things, most of my games the Protectors annihilated 1-2 units and then spent the rest of the game just shuffling along trying to make long charges.
I think I would run something less all-in for future games, you can abuse Skyborne a lot with proper bubbling and movement shenanigans. I want to experiment with a minimal Skyborne - just cutting down on Protectors to get more support units. That, or go more all-in on Skyborne and bump up the Decimators to 10 and the Protectors to 15. Suddenly you can cover way more of the board and 45 wounds Battleshock-immune wounds on the Protectors can take some serious time to chew through.
Aetherstrike will be my next list to try but I'll keep Skyborne in my back pocket.