i picked one of the shorter handled models(the X25 i believe) before they started making the one with the 36" handle. i have a hard time using anything else when splitting wood. if that ax won't handle the job, you need a wedge and sledgehammer or a hydraulic splitter.
i was so impressed by these axes that i convinced the saw shop i used to work at to start carrying them, they became a huge seller.
i did pick up a 36" model for my dad's birthday a few years back, and truth be told i actually like the shorter handle of the one i have better. i can swing it faster than the longer handled version, and don't strike the handle as much either.