Given that the wood cutting buff lasts the same amount of time with the same cooldown but only adds like 20 dmg, it is, for the time being, worthless.

The combat buff is good for tanky builds but me and my friends were sticking to Eikthyr's buff most of the time anyway as running in and out of combat costs a lot of stamina.

Moder's buff is great for sea exploration as has been said above.