I would get one if I found it at a yard sale cheap.
Actually what I would like no one builds,. but would like around a 20 or 30 or 40 ton one with a decent wedge, something you could just lift and throw over real big gnarly crotches. Or have it on a hand truck, roll it up, tip it over, slide it in place, then start cranking. Have to be man portable that way just for oddball pieces for cheap. I dont have a tracked skidsteer with a big splitter attachment to do that with, nor am I going to have an extra ten or twenty grand anytime soon, so...... Bust em from the top with the log just laying on the ground. Some big stuff like that I just noodle, but some is so wicked dirty it would be better to bust it in place. that last big chunk at the base o big trees, the actual stump..them suckers are almost always dirty, twisty, hard to bust even with wedge and sledge. But..that is the best wood on the durn tree too for burning, once it is dry.
Heck, heres another idea..we have those log winches that are chainsaw powered, why not a real light weight buster you could attach to your chainsaw via..insert pesky engineering details here... right out in the field for those pieces? It wouldnt matter if it was slow, you wouldnt use it for every piece, just the wicked nasty ones.