I've discovered Splitfire splitters and everything else is half as good in my opinion. Below is a quote by someone else on the arborist site who suupports my opinion:
All the splitters on the market are all basically the same design. except split-fire. i split by hand for years, but acquired a bunch of pinon pine, toughest splitting wood i have ever split, knotty, pitchy, grain is about as straight as wood screw threads. so i did alot of research and found split fire. it has a ram under the bed, with a 2 way, or 4 way wedge that splits in both directions. two people can bury the splitter in about an hour. they say that with support equipment (conveyor), it can do 5 face cords/ hour. i believe it. i bought mine in september, and have already run over 250 face cords through it, about 85% pinon, the rest aspen. you never have to wait for the ram to return, it is always on the splitting stroke. mine is a 290-4, 9 hp honda, 2 way and 4 way wedges, wouldnt want to tow it at high speeds, or very far. but it is the fastest splitter on the market i believe, high quality, according to manufacturer should last me 1500 face cords before i need to do any service on the sliding mechanism. at over 250 face cords, the only wear i see is on the paint! dont have the web site address, but they are out of norwich ontario