Got the Helko and spent an hour testing it against my other two mauls: one, an 8 lb, fiberglass-handled model from Bailey's; and two, the 12 lb "mega-maul". In all honesty, I had an opinion about how the test would go...I would use the Helko until I got to a round I couldn't split (which I didn't think would take long) and then break out the monster and let it triumph. I was splitting rounds of Emory oak that I cut yesterday, the largest around 14" in diameter and maybe 16-18" long. I also split a few with my old fiberglass maul, just as a constant.
Of course it's impossible to control all the variables in a test like this. Ideally, one would split a round, then reassemble it at the molecular level, and hit it in exactly the same place with the same force with another maul. Of course the variables of force, placement, variation in wood make this somewhat less than a rigorous scientific treatment, but here it is for whatever it's worth:
To my great surprise, I never tried a round I couldn't spllit with the Helko. The toughest, biggest, most twisted specimens took maybe 10 whacks, but they always split. I then started experimenting with the other mauls, doing my best to do equal comparisons. Quickly, I discovered that both the mega and the Helko "mauled" my old maul. I soon quit took it out of the rotation.
Differences between the two finalists were dramatic. I swung the Helko all the way around, and one could really whip up the velocity with the 5 lb head and long handle. The more I used it, the more I liked it, including the shape of the handle, which I had a poor first impression of. The mega is just plain old 1940's tech, and feels like it's solid, welded steel (why, and so it is). Nothing fancy, but just brutally effective. I just raise it straight above my head and then add whatever force I can to the considerable mass. Man, there's no give in that thing. A completely different splitting experience than with the Helko.
So which maul is the big winner. I still think the mega, but it's close. The Helko doesn't do the job unless one really whistles it up, and as I started to tire I think it was easier to use the mega. But I really like the Helko, it's a great tool and a keeper. I'll be using them both, lots of wood to split. If I manage to post the jpgs you'll notice that both heads are in some ways similar: a fairly sharp edge, and steep angles. The mega is just a simple triangle, while the Helko had much more complicated geometry, it seems to be hollow ground. Split on friends...