Survivable 4++ save (rerolled near Fateweaver)
Massed fire (60+ shots at 18")
Great overwatch potential (often poor actual results)
Large deepstrike footprint
360-455 points that can mishap
Low BS shooting
Now that I have a copy of the rulebook I can confirm the rules that have been leaked before. Namely that they are now 9 points, minimum squads of 10 and gain ward charges as the squad size increases.
One big drawback is the loss of overwatch, but this is countered with the increased 6" range on the shooting attack.
I'll compare their efficiency against terminators, marines and guard. Given that flamers and screamers were majorly hurt by the new codex the horrors will have to stand up to various threats if a Tzeentch mono-build is to remain viable.
Some complained that my comparison before factored in disproportionate squad sizes, and while this was true the point per kill levelled the playing field. This time I will compare squads of the same point cost to please the nay-sayers. It just so happens that you can get 17 new horrors for the same cost as 9 old horrors. Since 9 is the number of Tzeentch there must be something to this...