Yes, with DD7 it's been in-class differentiation every year and I've been walking the tightrope. I notice a big difference with DD5 being subject accelerated to a higher grade for reading and math. My feet feel much more firmly planted!

Seriously, I've also noticed a big difference in my relationship with the teachers with acceleration vs. non-acceleration. You can't appreciate a good teacher as much when there's a big disparity between the curriculum and what your child needs for curriculum.