Crushers can take an icon and gain scout with Karanak for the sake of accurately deepstriking Khorne units deep into the enemy DZ turn 2, but that's about the only reason that you'd want them over hounds. Works well for grinders and occasionally 'letters. They [crushers] can have a character with access to AP2 on their own anyway even without the herald though, so technically it lets you either put the herald in another unit and have multiple AP2 threats, or have a second model in the unit who can't get bogged down in a challenge and attack the unit directly. That's about the extent of their uses unfortunately (other than looking awesome IMHO). Much better when brought in via incursion where they're free, and I often prefer them over screamers.
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