I tried that to split in two on the fly for garden purpose a log of Arizona cypress. Maybe 20" down to 16" diameter and about 17' long. It was by eye sight, so not so accurate to start with. It works well enough, but it's easy to deviate a little each time and bite the side of the kerf. I got a kerf a good bit wider than I wanted but not so bad for a first try.
I was more pleased than with my first try with the chinese alaskan mill. It was a 36 /34" cedrus log, 3 meters long. I cut 4 slabs for the HO, but they were curved in the width. Looking more closely, when the mill's bolts are tightened, the bar is bowed ! I have to work on the parts to get them right.