L.H.
Ok, this is coming from someone who has Montessori training and can really get into the description of what it is all about. First of all, I can't begin to tell you there have been studies on the brain in respect to the development and Montessori education. One neurobiologist states that the brain has more active parts to it from the very specific laid out process of a montessori education. There is a very specific reason for the Montessori set up and including the schedule. The goal of a Montessori program is to get a child to be independent and confident in the things they do on a daily basis. It is not just about sending them to a preschool or letting them run around. It is about having trained professionals who have gone through a very rigorous training, I can tell you from experience that it isn't taken lightly when it comes to the needs and development of a child. It should be taken very seriously, right? We want the best for our children.
I don't want to tell you that other programs aren't worth it too, but you should know the benefits of Montessori are outstanding. Rather than going off of opinion, listen to your own instincts, maybe find out a bit more about it if you want, but it needs to benefit the family as a whole, not just your mother or mother in law.
I seriously could go on for a while about what it brings the child, but if you are talking primary you are really paying for a child to learn to work out some really important developmental moments that Montessori teachers have been trained to recognize and bring out within the child for success of them feeling that they can do it, because trust me, the want to. Think about the child who wants to help with the dishes, water plants, fold laundry, there is a reason for that and the Montessori classroom for primary has been set up for all that exploring. Plus, the idea is that they are even learning how to count and read. That is a great preparation for elementary to come.
Hope it helps