Any Forgeworld 'Nids worth using?

[commandersasha]

I have entered a Tourney that allows Forgeworld models, which I have never bothered looking at. Are there any FW Tyranids that I should really consider?
As I use Skaven-Counts-As-Tyranids, I'm always looking for excuses to develop ratty proxies, so the FW models are irrelevant, but are there any amazing must-have rules?

I guess I'm asking about the Meiotic spores (ratty dirigibles!), the Heirodules, Harridans and Hierophants, or are they Apocalypse-only units? Are there any others?
Where are the rules for these models?

Thanks if you can help!

[Raven]

There's a discussion on the Stonechrusher Carnifex and his viability in 6th edition here thetyranidhive.proboards.com/index.cgi?board=general&action=display&thread=39744&page=2

Hierodules and Hierophants are Apocalypse only. I would expect Harridans to be Apocalypse only but I may be wrong about that. As far as Meiotic Spores, Malanthropes, and whatever else they have I'm really not sure, sorry I can't be more help.

[pom611]

The harradin is apocalypse only

[omnivore]

What book are the Stonecrusher rules in?

[swarm492]

Imperial armour apoc second edition.

[tarrasque]

Meiotic Spores are 40k legal. They're basically giant spore mines that spit out smaller spore mines (and do some decent AP3 damage) when they explode. They're fun, but not a "must have" type thing. It's rules are in Imperial Armour Apocalypse: Second Edition, like the stone crusher carnifex.