I find it interesting that he does not use a chopping block.
I bought a fiskars x27 but don't really think it lives up to the hype. It is lighter and tends to get stuck less than my other splitting mauls but I don't think it actually splits rounds any better than a traditional splitting maul. I even bought the sharpener for the fiskars. Don't get me wrong, when I split by hand I usually grab the fiskars, but my results are less fantastic than most of the reviews I've read.
These fiskars are lightweight, the only way they build up good kinetic force is to be able to swing them twice (whatever) as fast as a maul. 10% faster won't work, you'll be disappointed.
Takes some time to develop the muscle memory needed to switch from havy maul to lightweight splitting axe. I have found a fstraight overhand swing, feet apart straight in front of the round, is faster, rather than the one foot forward, off to the side maul swing I was using for years.
Depends on the wood, too. I have to use all my junk to split, just varies once I get into a group of rounds, some (90%) is fiskars bait, some is maul, some is sledge and wedge, and some, crotches, ultimate twisted gnarly, is chainsaw/noodle.
As I am getting older, I am trying to eliminate swinging the maul and sledge, and making all my wood fit into either fiskars or noodle. Just can't handle the 8lb maul all afternoon. I still use them, but....really trying not to.
The best thing for me with the fiskars is I don't get beat on/worn out. And I can motivate the speed easier than the brute grunt to swing the heavier maul. Just don't got the beef for that any more, not much anyway.