I've been using Daily Grams for years with my kids. They are an excellent tool for reinforcing and practicing grammar. I don't necessarily use the proper grades, though. To save everyone's time, I lump kids together and have them use the same grade so we can go over them together. Love this material!
We haven't been using it for very long. I do like that it is simple and very "teacher" friendly. My son thinks it is a dry and would like less repetitiveness. This is our first year and this was recommended by a friend who has been homeschooling for years but her children are younger. She love it and so do her kids.