I have never used it, but based on the picture and specs given at :
http://www.dukeshq.com/Knives2.html
there are a few immediate problems. First off the hatchet head looks like the edge has little sweep. This is bad for two main reasons. First off it lowers the performance of the heel and toe of the bit as point penetrators which is nice for fine cutting. Second it lowers the raw penetration for chopping as the sides grate along the cut, this is only relevant if you are multi-chopping a piece of wood larger than the face of the hatchet.
In addition, while I think that a deep cryo does have advantages, even for axe heads, it seems to me here that this is akin to Cold Steel claiming "Yes, we are using 420, but it is cryo treated 420". That is to say that it is more hype than substance. However this is a gut feeling, nothing more. You would really need to know the details of the heat treatment to know for sure.
The heads on these style axes also often have primary flat bevels. I can't tell for sure if this is the case here, you would want to handle one. If this is true then it is something to generally avoid as it is not the optimal geometry which is the traditional convex -> hollow -> convex. The edge looks a little thick as well, again the picture could be misleading however.
Finally as DWK noted, the Bruks line just dominates this class of axes. The above site offers the axe for almost 50% more than the Wildlife hatchet.
-Cliff