I didn't get to the fancy options I was excited about, like the Gantt chart, because the basic functions didn't even work for me.
Even with a tutorial, it took forever to figure out how to use recurring tasks (which is the keyword, btw; "repeat" doesn't work), and they're very annoying, showing up NEW every time they are due instead of moving. In other words, if you have a task that repeats three times a week, you will end up with 30 visual occurrences of it on your list by the end of 10 weeks. On the to-do list, mind you, not just the calendar view.
The check box for completing tasks is hidden until you mouse over it, which of course you won't do because you don't know where it is. And without the checkbox, the recurring tasks don't work. If you mark it Complete with the status bar, it stops recurring. If you leave it not Complete, then it doesn't move the due date to the next time.
Tasks appear on the calendar for the date they were CREATED, not the planned or actual START date. I tried experimenting, but it stayed on the created date.
I do like the color-coding and customization options, but I need the basics to work first.