well, I will describe my child and tell you that Montessori fits my child perfectly.
Maria Montessori's work was initially intended for special education kids. It was her vision for the needs of the child to be respected as a priority while a learning environment invited individuality! I can imagine how it must have helped special needs kids, and it is just a dream for kids with high levels of individuality on the entire spectrum.
My girl is 7. 1st "grade'. They do group classes, so it is a mix of K-2nd.
DD is dramatic, highly emotional, imaginative, cocky and intuitive.
When given a box of 'words" ( a little shoe, a spool and a spoon) she will create a novel about these items rather than just write the words. This is encouraged and there is no 'format', only goals.
I love our Montessori school. I love that there is all wood, no plastic, no overhead lighting, sitting on the floor, gardening, diverse culture and team teaching and peer grouping rather than grades. It is highly academic although there seems to be no pressure on that. The kids are eager to get to the next level!