All I can say is ouch. Nice and shiney, but of little other value.
wdavidhicks, you are correct about the tranny case being a part of the chassis for the truck, however it is there more as a shape holder vice an actual load bearing member. It helps to keep the box-beam shape of the chassis and thus maintains the strength. If the truck were to take some serious head on collisions on a regular basis, I might be able to make a viable arguement for spending the change on this kind of upgrade...but the once in a while impact shouldn't everstress the stock tranny case too much.
Just food for thought.