I've never used a splitter; I have a question or two.
I cut mostly Douglas fir and Alaska yellow cedar for firewood, most of it splits really easy with a maul.
Do you guys use a splitter because your wood is tough to split, or because it is faster.
It seems like I could move from round to round faster with a maul than I could haul each piece to a splitter. Maybe I'm missing out on something good?
Much of the hardwoods are harder to split, Elm and Ironwood as 2 examples. I'd bet that a decent guy with a maul could split a cord of softwood in the time it takes to split a face cord of elm.
Don't forget also hardwoods are alot heavier, your doug fir weighs about 33lb/cu ft and the Hickory I burn weights 48lb/cu ft. So when moving the stuff I'm moving a good 50% more weight. But on the flip side I burn 50% less (volume) than for the same amount of heat.
When I'm splitting I'm taking 16" pcs out of the yard trailer and put right on the splitter. The splits fall off the end of the splitter right up against the pile where they get stacked for the next couple of years. If I was splitting with a maul on the ground I'd have to dump the load, split them, toss them over to the stack. More work than the splitter.
My splitter is a kinetic, very fast, less than 2 seconds cycle time. I have run hydraulic splitters that a decent guy with a maul could beat in a speed race as long as they are splitting easy stuff.
So on both accounts, at least for me, there is less moving of wood with the splitter and the splitter is very fast. Plus a splitter will split tough chunks with crotches and big knots easily.
If all I split was easy stuff like you I don't know if I'd bother with a splitter.