I've been totally frustrated carrying larger axes or hawks in the field. They look cool and may be more "correct" to some folks, but they're just not practical because they're too big for convenient carry. I'm not going to need one in a brawl or cut a cord of wood, much less build a cabin with any of them. I need it for moose or elk, cutting a little brush for a quickie duck blind, or splitting kindling.
I got one of Bart's bag axes, and feel like I finally got what I need. I've used it just enough to say it does the job, even if I got it too late for elk or moose dressing. I can split the pelvis and rib cage of a deer with a pocket knife, so that's not a fair test of the axe.
I'll say one thing about a small axe. It better be sharper than sharp if it's going to do the job. I'd probably put more emphasis on the steel used, how it's sharpened, and carrying a small stone for touch up than I would any other design features. Bart's sharpened up really well and is holding a great edge. After that, shape and features are drawn from the hearts of the builder and user.