I've been using it this year with all my kids, although I just stopped with dd10 because she wasn't understanding any of it.
After a couple months my kids (on their own) began doing an entire week each day, so basically covering 5 sentences a week instead of 1. Even my 2nd grader was doing this voluntarily! So that's another way you can use the program. I'm going to continue with it next year.
There is not much instruction, so I'll sometimes use google if I need help teaching.