Initial sharpness varies, even with GB aces I have seen some much sharper than others. I sharpened this the weekend to a fine shaving finish which took little time, a few minutes the bit responded quite well.
I used it on some slightly seasoned pine (<1 yr) as well as some really old and knotty spruce. The relative performance compared to the GB Wildlife was 74 +/- 4 % through 26 sections of wood cut.
The power on the impacts is *much* greater, based on the mass and greater handle length it should be about double, thus the efficiency of the axe is low, ~37% of the GB hatchet.
It does have a large advantage in regards to cutting very hard woods. With the bit so thick I just blasted into the hardest knots, cleaving them off the sides of the stick with absolutely no hesitation. If I tried this with the GB the edge could get damaged.
The temp was about zero, and even lower I would not be concerned about the edge on this, even on thick bone cutting it should hold up fine. I only had a few chicken and pork bones and it readily tore into them with no problems.
For regular cutting, it is also far behind the GB axe, it takes ~63 +/- 2 lbs to press cut 3/8" hemp, far much more force than the GB hatchet, which again isn't surprising as the bit is so thick.
It depends on what you want, for general wood craft, this is far behind, but it is a lot more durable. Though you could simply put a 22 degree microbevel on the Gb hatchet and have a similar high level of durability with a lot more cutting ability.
Handles well though, nice balance, head seems strongly attached, etc. .
-Cliff