They look intriguing. Does the butt end dig into your hand at all?
Hurrul
Good morning or evening to you CAD -
At least with the brown burlap example, my smallish to medium hands don't have any issue in a hammer grip or reverse chest lever type grip.
When auguring a hole or doing work with the tip, I tend to choke forward and use a pinch grip, grasping part of the handle and part of the blade so I don't typically brace the pommel face flush against my palm and then press down on it.
However, the bottom wood handle example has a different pommel than the 2 above it and it has enough of an abrupt edge to increase pressure and possible discomfort if you were not wearing gloves of some sort while using it in the example task above (choked back on the handle and the pommel face nesting in the palm or meaty part of your hand) - I am speculating, but it seems to be an older variant of the model and the other 2 were subsequent iterations that addressed your concern with a different pommel design.
I don't have much field time with the older model, but it seems that it would behave differently than the brown burlap one, if the 2 were compared side by side, performing prolonged work during a tip oriented task.
I don't have any photos convenient to illustrate the differences in the respective back ends, but I will try get some this evening and post them for additional reference.
Thanks for reading.