Great expention, pretty short, but lot of fun. Buy it if you are a Saints Row 2 fan. Buy it if you like new vehicles and hairstyles and clothing and other costumization option. DONT buy it for the story mission, because there are only 3 of them.
I wish I could justify the purchase with this content, as I love Saint's Row and I enjoyed the three missions on offer, but I've spent more time playing with a McDonald's Happy Meal toy than I have finishing Corporate Warfare.