I was actually just considering posting on this. For the most part I don't really see that the added functionality out weighs the weight of carrying around a big knife. It doesn't chop very well, atleast compared to even a small hatchet or axe. The heavy pry bar type knives don't slice as well as a smaller lighter knife. I just bought a small tomahawk that weighs in at 14oz. Lighter then a lot of big knives, but because almost all of the weight is in the head it chops much better. I don't need to baton light branches and for heavy branches I can use it as a wedge anyway. As I pointed out in another post recently a lot of trees, especially pine which is prevalent here, don't burn with the bark on. So an axe to split logs beats out a saw.

Right now I carry a 3" mora knife as my daily carry and I'll add the tomahawk to that while out hiking or camping.