I used Sonlight last year and we LOVED it (core 1+2 and 3). My only drawback (and the reason I switched to Heart of Dakota) was that I felt we went through too many books. I wanted to “simmer” more on each book and let the kids narrate more from each one. We will continue to use books from Sonlight for their free reading time since they are awesome at picking great books.
I still wanted a boxed curriculum because I tend to bomb when I pick books out on my own. I also went with HOD because it already has poetry, studied dictation, art, bible, and written narration scheduled, which takes a load off of me. 🙂