Essentials in Writing has worked well here. I’ve used levels 7-12 (but only a bit of 12).
Level 7 came out the year my oldest was in 9th–it was the highest level out that year, but Cathy Duffy’s review said it would work fine for high school, so I used it because my son really needed the approach. I wrote a review about doing that on my blog.
All of the likes that I wrote there apply to the high school levels as well. I haven’t had the sound quality issues since, so they have fixed that. This is an incremental approach, the author does a good job of modeling the writing process (including modeling the process of making mistakes or changing your mind as you write), and the videos are short–very doable in that way.
One dislike I would add–in level 11, I didn’t feel that the lesson on writing a literary essay properly prepared the student for writing any essay that wasn’t using the same device as the example given–I think that part needs work. (I suspect 12 is probably the same for that particular essay–we actually won’t get to that this year because we are only using 12 for this spring–my dd has used EiW for 5 years now, and we’ve done more writing across the curriculum and things like working on scholarship essays instead, so I’m just picking and choosing from the EiW assignments).
All in all though, it really helped us establish a solid writing base, especially for my oldest, and helped him succeed where other programs didn’t. (My youngest didn’t have the same struggles and probably would have done fine with any program). I even solidified a few comma-use rules for myself! He always starts off by working on sentences and clauses, then paragraphs, and then to essays and a research paper. We found that to be a very helpful progression.
HTH some!