I didn't see a thread on this (maybe I missed it) but I just got the White Dwarf update and it's pretty interesting. My opinions:
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Slaanesh Chariots
I never liked or understood chariots too much, frankly. These are about the most expensive ones in the game. The exalted and such definately are. Yeah, they're fast. They have a ward. You got poison. I just don' t know if they are much better than their component parts.
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Hellflayer
Same as above. Extra hits based on impact hits (which you might not get). And it's Rare. Meh.
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Flamers
Their
Str needed to come down to 4. I think they were nerfed too much, however. This is the army's only shooting (other than new Soulgrinder). They are basically worse than Leadbelchers in range, penetration, wounds,
WS, attacks, etc. They are Daemonic, flaming with +1
BS. The big change is they are Special now. Their new Warpfire rule is very odd. Not sure if it's an oversight but they no longer mention that they don't suffer -1 for multishot. If they do suffer it, they become a whole lot worse.
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Screamers
They changed the most by far. I'm not sure if
DoC needed monster-killers before but they got them now. The min size Screamer unit can basically massacre Large Targets. Their flying attack got weakened, but they are now roughly flying, daemonic ogres (-1W but +
Init). If anyone ever used Large Targets, they would be great. As it is, if you don't expect any, you're probably better off with just Core or Seekers or something. But they are still vastly better than they were before.
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Soul Grinders
The literally new big boys. Jeez, I had no idea how large that model was. It's kind of hard to figure out what their purpose is exactly. The grapeshot isn't especially useful as the range is so short and they are so fast they can get into combat pretty quickly (and do more guaranteed
dmg). Physically, they have really fantastic stats with 7T and 6W and better
Init than most monsters. Their attacks are a bit on the low side compared to stuff like the Arachnarok. But they got 4+ armor, 5+ ward (daemon) and that high Toughness make them extremely hard to hurt except by war machines, monsters, or maybe Seekers

I could see getting the daemonbone claw just in case another monster, or hero, dares fight it, but the other upgrades are awful expensive. You're not going to sit there with a 300 point stone thrower chucking rocks. That's a waste of points. Because of it's thunderstomp and high defenses you should dump it into combat where it will also get immunity from shooting and (many) magic attacks. SOO, I'm not entirely sure it's purpose. On one hand, it's just another giant combat monster. But at least it's not a Lord and it doesn't cost 450. You can look at it as a baby Bloodthirster with a gun that if it dies your army doesn't fall to pieces. Also, since most people forgo using Greater Daemons and just get tons of heroes, this is still a way to have a heavy hitter. In some ways, I question the concept of multi-purpose weapons. The Ogre Ironblaster is good because of the cannon stats, but it's really just a super expensive cannon. Yes, it can resist being engaged in combat, but it's a cannon, you don't want it in combat. Like the Beastman Cygor. Would you rather have 1 monster-war machine combo or 3 war machines? I understand the balance, of course, it's making those non-shooty armies pay out the wazoo for getting a war machine.
Also, the new models look pretty cool. I'm surprised they redid flamers, as they looked good anyway. And I was kind of hoping for rules changes on some of the other stuff (Core and
GW and Rares). But overall a decent update.