I'm 6'4", and one time I borrowed a hori/verti splitter from a colleague (forgot the brand, standard yellow one from the orange store. CHampion?).
I ran it vertically, and I liked it. The crucial point is to have a helper that brings rounds to you, so you can stay seated and efficiently run the splitter handle. Throw the splits (far enough, so you don't build yourself into a valley of split mountains) away, take the round just brought to you, and go.
This was with 20-30" dia red oak, so not light. Just have to handle them like gas cycliners, tilt and roll on the bottom circumference of the round.
I ran it vertically, and I liked it. The crucial point is to have a helper that brings rounds to you, so you can stay seated and efficiently run the splitter handle. Throw the splits (far enough, so you don't build yourself into a valley of split mountains) away, take the round just brought to you, and go.
This was with 20-30" dia red oak, so not light. Just have to handle them like gas cycliners, tilt and roll on the bottom circumference of the round.

![[Hearth.com] Vertical Splitter [Hearth.com] Vertical Splitter](https://www.hearth.com/talk/data/attachments/301/301673-aa84046ba3157cf925cecbb733658b63.jpg?hash=0l7v6FTAuy)
![[Hearth.com] Vertical Splitter [Hearth.com] Vertical Splitter](https://www.hearth.com/talk/data/attachments/301/301674-62fbaaf8453f5da635b692a44d4ee8ea.jpg?hash=OGuzhey4uK)
![[Hearth.com] Vertical Splitter [Hearth.com] Vertical Splitter](https://www.hearth.com/talk/data/attachments/301/301675-182e172e92d83effbaf152e3d12bcbbb.jpg?hash=_wiIbmYw5h)
