What bugs me about the Catachans is that they obviously don't wear flak jackets.
It is stated repeatedly in each of the Codices that you must show the equipment carried by your models. Then GW goes off and makes an entire regiment of Guardsmen, who obviously aren't wearing flak jackets, and tells us that they are!
So... why can't I just say that all of my tanks have extra armor on them without having to show it in the model?
I know. It's basic gear, so it goes without saying that the Catachans have flak jackets. It just seems inconsistent...
It would have made more sense to let you buy 5pt troopers without the 5+ armor save than to say that all guardsmen have the flak jackets and the armor save. Many of us would choose to save the extra point per man since a 5+ doesn't help against Marine and Eldar basic weapons.