Ive been using it for a year or two now. Its a good way to have a quick glance at your schedule. It takes a bit of learning if you have a complicated schedule like I do.
The only feedback I have for the developers would be to add a Today button that would return you to todays date; also I would change the scrolling and interface to work more like iCal and similar software. As it is, it feels a bit clunky to scroll.
Thanks,
Abbyguy about Shift Worker, v1.5.4