The way it is described (workers have 6 days on, 1 day off) is identical to the old system, so in terms of wages, productivity, and cost of materials it is actually identical.

The only difference is lower costs for machines; since machines are never idle you need 6/7 as many.

By example, if your widget factory has 7 workers and 7 machines, by shifting their schedules so each worker takes a different day off, you can do the same amount of work with only 6 machines.