At least once I week I get an email from someone who has seen my old model pack videos on youtube, and want to use them for FPSC/GG/GGM. The GG/GGM users are always disappointed that the characters don't work the same as in the video. When TGC took these old characters and shoehorned them into GG, they lost a lot of functionality that they had in FPSC. That's why I'm hesitant to recommend using the NPC control behavior, most people are disappointed that they can't replicate what is seen in the FPSC videos.
Here is the Viral Outbreak video, I get questions about this one a lot:
These characters use scriptable shader variables to control some gameplay elements. For example one of the characters is nearly invincible and has regenerating health, but if you can shoot him when his eyes turn yellow, it will result in an instant kill. Other characters have randomized attacks and knockdowns, and will randomly switch between walking and running to keep the player uneasy. The final Medusa character, has animated tentacles and a fiery death. None of this is possible in GG/GGM.
This zombie pack is another one I get asked about a lot. FPSC has limb-hit detection! So you could target the character's arms,legs, torso, and head. You could even shoot at the legs to make them fall to the ground and start crawling. A great way to slow down an onslaught of enemies! Again, most are disappointed that none of this works in GG/GGM, so I always warn them. Why all this functionality was removed for the GameGuru products is beyond me, but there must have been a good reason is all I can think.