There is a wide, ever-growing body of research and analysis that supports the Montessori Method. Many Montessori principles are becoming mainstream and are even being integrated into traditional classrooms. The articles below answer many questions and explain the benefits of the method.
The Most Common Montessori Myths (montessorihomeadvantage.com)
Differences between Montessori and Traditional Education (montessorihomeadvantage.com)
"Montessori preschool elevates and equalizes child outcomes" Angeline Lillard et.al., Frontiers in Psychology
"...over time the Montessori children fared better on measures of academic achievement, social understanding, and mastery orientation, and they also reported relatively more liking of scholastic tasks."
"Montessori Education provides better outcomes than traditional methods, study finds" Angeline Lillard & Nicole Else-Quest, Science
"A study comparing outcomes of children at a public inner-city Montessori school with children who attended traditional schools indicates that Montessori education leads to children with better social and academic skills."
"How to think like a genius: The Montessori method" Roberta Ness, Houston Chronicle
"Montessori preschool students have been shown to out-perform traditional students on standardized tests of reading and math, and also possess advanced social skills."
"Rethinking the colorful kindergarten classroom" Jan Hoffman, New York Times
"If young children were seeing so much at once, they cannot independently differentiate what is important; they may tune out the teacher."
"I've got 5 minutes. Explain Montessori to Me." childoftheredwoods.com
"We are humbled by the great possibilities that exist within the tiniest of humans, and we respect their inner wisdom."
"Why Montessori education is priceless" Sunitha Pailoor, Montessori Life
"The greatest gift that a Montessori education gives to children is the joy of learning. A quality program is one where students come to school eager to learn, not because the teacher is going to lecture to them, but because in the environment there are many opportunities to learn and discover."