I've been working on finalizing my list for the upcoming GT (Grand Tournament) in SF (San Francisco) in JN (June).
The list I'd been playing with was working well, except for the Cold One Knights. I gave them a chance but they never seemed to make back their points and just felt awkward on the table. So I tried swapping them out for some Dark Riders and Harpies, two of my must-have units from 7th edition. The Harpies seemed ok, so long as you don't try to use them for march blocking or redirecting.
The Dark Riders, on the other hand, just didn't feel right either. Everything moves so fast now and not being able to charge on turn one kinda takes the wind out of the vanguard move. As with the Harpies, march blocking and redirecting aren't really possible anymore. They just felt awkward. Fast enough to get to anything, but not really hard enough to break anything other than small units and war machines, which the Harpies could do for half the points cost.
I think I've come to the conclusion that I just don't like cavalry in this edition, at least not the Dark Elf options. Unless I'm willing to field a really big (and expensive) block of them, they just aren't worth it. Seeing as how I can often get my infantry blocks into combat on turn 2, and certainly on turn 3, the extra movement on the cavalry doesn't help.
So my newest variant is to have two units of six Shades and two units of five Harpies with no Dark Riders or Cold One Knights. The Shades are cheaper than Dark Riders, have better weapon and ballistics skill, and get two attacks. Plus the scout deployment lets me start them in good enough positions to go after soft targets the Dark Riders would have targeted anyway.
I tried this list on Thursday against WoC and Sunday against Dwarves. I tabled the WoC army in turn 5. The game against the Dwarves went all six turns but I rolled more sixes in a single game than I normally roll in 3 games combined. Needless to say, there's not much a Dwarf player can do with Witches doing around 10+ wounds every round and Corsairs with Mindrazor cast on them every combat round they fight in. By around the fourth turn my opponent felt the need to start pointing out the high number of sixes I was rolling. I agreed to give the guy a rematch some time soon, since I'd really like to see how the list performs when I roll normally.
At any rate, I liked how the dual Shade units felt much better than the Dark Riders. I'd still like to play a few more test games, but I think my list is pretty well set now.