GC was a really good mod, but had a bit of a different approach to gameplay. FS has a bigger focus on authenticity and atmosphere and a very different approach to teamwork ("subconscious teamwork" and "withering fire" -- basically, the gadgets you're given and the fact that small-arms can damage vehicles means people will help the team even when lone-wolfing, and will naturally move towards vehicles to engage them, creating fire fights around walkers and whatnot).
Everyone, be sure to check out the FS Wiki (firstrikemod.wikia.com) if there's something you want to know. Or search the forums. Or start a thread
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"One of the bitches actually gave birth while she was attacking, and her puppies joined in on the carnage."
--the awesomeness that is Boatmurdered.