The Super Split line of splitters is rather impressive to say the least. In principle, the flywheel concept would be an enormous energy saver and very efficient with the quick return mechanism. The fact that this machine can run on either a gas engine or an electric motor that requires only 120 v power (like a typical table saw) is a bit mind boggling.
The demos show wood species that are rather easy to split, but it appears there are enough safety factors built into the machine that it would stall out on only the really tough wood like elm and crotchwood. Several rams might be required on tough billets, but heck, we run into these "unsplittables" with hydraulic splitters also.
In my book, this innovation is really worth considering.