I have split wood by hand for decades and have used 6 + 8 lb mauls, monster mauls of various flavors, wedges with sledges, etc. Once I tried an X-27 I bought one, and it is the only hand splitting tool I use.
I now have 3 of them, one at the house, one at the cabin, and one stays in my truck. I even keep one handy when using the hydro to cut through the stringy stuff that did not split all the way.
I have split some very large rounds with them, and have split through some knots I would not have thought would split.
I keep my hands about 8" apart and give it a hard - forceful swing. If I can't split it with the Fiskars, it goes to the hydro, no other hand held is going to split it.
The light weight of the Fiskars also lets me go a lot longer than I could with a maul. Until I run across something better, I will not be w/o one. Also, I have not broken any of their handles.
Can't remember how many other handles I've broken, but when a wooden handle breaks and the 8 lb maul head comes back at your face, I can tell you it is something you don't want to happen again (at the time I switched to the metal handle monster mauls). Luckily, I slipped that maul head and it just brushed my cheek as it went by.