I took the axepill, as jointly recommended by /diy/ and /fit/. I have been chopping through a large and knotty pile of different types of wood all summer. No power saws; just my axe and my splitters and my bowsaw to get certain pieces under the 18"/46cm recommended for sale as firewood (I have sold off 4 cords for spare cash thus far while keeping the others for the wood stove that /diy/ also recommended that I install).
Some observations:
>I definitely got stronger. Smashing full-force into dense rounds of wood is violent exercise that jolts your whole skeleton. My fingers and wrists are measurably thicker after just 6 months.
>My lower legs took a beating. Sometimes, chunks of wood fly off and nail me in the shins. I could take protective measures against this, but any additional gear makes things even hotter, and during the summer, that's just no good. I chose to take the hits. I have scars, but no actual broken bones.
>You need more water than you'd think. I could suck down whole gallon of icewater during a 2+ hour battle with a large chunk of wood full of knots, and still need more.
>This is tough on the elbows in particular. After several months, I can tell that I need a multi-week fall/winter break to let my arm-joints heal up and stop hurting.
>Shit breaks, even good shit. If you are hitting hard every day, splitters and axes will eventually develop microfractures which grow into macrofractures and require repairs or replacements. No way around this; even oldschool loggers complained about this.
>You get better over time. You can glance at the top of a round of wood and immediately note the direction of the fractures and rings and start swinging/splitting to exploit those flaws. You know where knots and branch-stubs are located intuitively.
>My legs are beefier from carrying buckets of cut wood over to the piles.
Overall, 7.5/10. Some nice gains since March, but also more and more injuries accumulating over time.