YES!
I'm using Bigger right now for my third grader and it's been fantastic. I will tell you that whatever you choose, in prayer and petition, allow the Lord to speak to your heart and then be at peace. Our first couple of months have been a struggle, but not because of the material. Just adjusting to homeschooling in general. Because you are already used to hs'ing, you won't have this.
For me the struggle has been worry that I am not doing enough academically when dd complains about math or whatever. Mostly because my dd used to spend 7 hours in school and we only spend about 3-3 1/2. Certainly I'm missing something? Worry...worry...fret and worry.

My challenge has been to see how different her education is now. Richly based in BIBLICAL truth, history and character focused, meaningful activities, not busy seatwork, concise math lessons, and the best books we've ever had the pleasure to find. And my challenge is to look in her heart and see some issue we need to work on and tackle those, not jump curriculum!
I am re-reading Shepherding a Child's Heart and he talks about how unimportant grades are when compared to character building and it just struck right at my heart. Who cares if my dc are advanced in mathematics or science if they have no dligence or trustworthiness? If they have no foundation in faith?
That's why I love HoD so much. The academics are there, and I see that so much more as the units build on eachother the more we move through the program. But the way Carrie ties everything we study to biblical truth is the very best part. I have conversations with my dc that I would have NEVER had if they were away from me for so long in a school day. Praise the Lord!!!