I used to have a video of one. The outfit was out of Missouri, but, I think they went out of business.
To me, it seems like more of a natural way of doing the sawing. Sawdust isn't as much of a problem, you have better visibility on your log, and it is easier to move the sawn material. I didn't like their dogging system, as it seemed a little undersized. Production was supposed to be 3500/day with one man. Edger was an add on.
Sanborn, out of Maine, used to make a mill with a 27 degree tilt. It used wider bands and was a real good production model. Sawdust was no problem, and boards were brought back to the operator.
Lumber quality is often a sawyer thing. Better sawyers produce better quality lumber.