I have had only one child in Montessori school, and he is "my difficult child" no matter the school structure..

He was "smarter than the average bear" and got aggravated (and violent) when someone else messed with whatever his project was.

I think the staff there worked hard to help him, but I will always remember the day I drove home from helping my dying father with a bath and was presented with all the things my son had done wrong that day, even though I said multiple times, "I can't do this today...I can talk with you Monday about XYZ....I can't do this today...shall I call his father for you?....I can't do this today..."

In Montessori's defense, this child did not start to "fit in" in ANY school setting until he was 11-12 years old....