My Take
NoRedInk is a great site where students can practice their grammar. I really like the very visual way you can track student progress - it shows you in a nice spreadsheet your students' progress, color-coded by their success in that area of grammar. You assign grammar quizzes and lessons to have students practice different areas of grammar. What they have now is nice, I just hope they continue adding to it.
How I Use It
We use NoRedInk for about 10 minutes or so a day, as a sort of warm up before we begin writing. Students love being able to work on areas they actually need to improve in, instead of being forced to go along with lessons they may already understand. The major downside is there are many things they still need to add into the program. So far it's great, but more areas for students to improve in would be better.