if you're talking about Extraction Point, it's a good game. since it's just an expansion, you should obviously get similar frames to what you get on the original game. the maps are larger and less repetitive. there are more outside scenes than in the original as well. i believe it also features brief nudity (lol sorry. one of the guys in my clan has a 13 year-old son that has the hots for Alma.)
anyway, i bought it when it came out and could swear that it was $20. for $40, you must be looking at the Gold Edition, which is FEAR and Extration Point.