In reply to beanieman:
I used x all mountains last winter.
Plus points,
Plunge a bit better than the axes with moulded handles.
Swing brilliantly very well weighted and balanced.
Upper pommel is adjustable and can be moved up if you have large hands like me.
All parts of the handles are replaceable if damaged.
Highly curved shaft, more than others, comparable on your list.
minus points,
The shafts are so curved, and the hammer head is small, that it makes hammering pegs and warthogs difficult, more so than axes with straighter shafts on your list.
Replacement parts not always available in UK. ( I sent to Spain for a replacement adze) although reasonable prices.
Hope this is of some help.