I have a 7/8 and 6/8 Otto Busch razors. Both extra hollow blades. Prefer them as the sound helps me keep the proper angle. They get louder as the angle become too steep/ less optimum.
Also they are much easier to hone and touch up. Very few strokes are necessary to get the edge shaving well again. The size/width of the bevel is very small/thin. So very little steel needs to be removed, vs heavier grinds I believe. My 2cent. Ken.