The Write Steps program is more of a framework. If you are not passionate about writing, it can hold your hand to get your students writing. They include videos to help teachers, and writing samples. I don't see it as being a very motivating program for those that love to write.
As part of the curriculum review process, I piloted Scholastic's Traits Writing and loved it. It was pricey. I weave as much of that into my writing lessons as possible. There are short interviews with real authors (of the mentor texts). I love the mentor texts that came with the program. Unfortunately, I am the only one that uses it.
I also am using a writing center. I had been looking for some new materials when I found Rory's story cubes at Target a couple of weeks ago. I made a writing center activity to go with the Story Cubes. There is a Basic, Getting You Started, and For Lefties version. Click on the link to download it for free from my Teachers Pay Teachers store or Teacher's Notebook shop.