I consider Montessori to be a great education method for children. I have placed Roey into Montessori daycare since he was 3-months old. (This was LePort Montessori in Irvine, California, where we lived.)  I also advertise Montessori system to to other parents. I run a Meetup group concerning child education, in which I tell guests about the benefits of Montessori. 

I went to the Montessori PSA conference in Maple Ridge, and saw the math teacher from Westside Montessori was there. He was demonstrating how you teach math (it was about square roots), and I was impressed.  You can read about my impressions by reading my blog article about it: https://medium.com/@borisreitman/square-roots-the-montessori-way-3d57eff86fda