We are using Wordsmith and we are enjoying it. I’m using it with four kids from 6th to 9th. It definitely takes a “building block” approach, beginning with teaching concrete nouns and strong verbs and building incrementally. To me, it has been just the right amount of practice exercises and writing. Not at all overwhelming.
I love, love, love Sharon Watson’s programs for high school and I use those for the high school writing classes that I teach at our co-op. I would say that Jump In is a good option for jr. high as well, but we decided to try Wordsmith instead and it transitions nicely into Sharon Watson’s high school writing programs.