I have worked with the units on the wall, I have worked with the econorolls IMO the best, and cut from the box. The loading from the wall was the least effective and in the labs I worked at they had them but none of the printers used them.... the econorolls held two rolls and dropped the exact cut into a paper safe below the rolls. Took up little space and you could really rock through a roll of paper on a large job.
A good day one could cut through five boxes of paper with little wastage, with the econoroll , no wastage.
Would not want to do those volumnes these days, out of shape