My Take
My overall take is that this app would be very appropriate and helpful to the students who need extra support with grammar. I liked that it was interactive, and in that way, (even ) the topic of grammar can be made engaging. Students can learn appropriate grammar and word usage and then transfer this knowledge into their own writing.
How I Use It
I would use this for individual practice as a learning station, especially for students who are approaching benchmarks, and need additional support in their writing. What worked are the individual assessments with on the spot reviews. As I did the practice assessments, some of what I edited was considered as unnecessary by the system. For example, one sentence had "16" in it and I corrected it to read "sixteen", spelled out. I guess I am a stickler for certain things.