It is great. We have observations and discussion group at the end of the day. We care deeply for each other's kids too, so the sense of community is a huge part of why we are in it. It makes homeschooling / unschooling easier when you're not alone. And Montessori materials are expensive too, so having a community to share the cost with helps a lot.
My son is really proud when he tells people he doesn't have to sit still in a classroom to listen to what a teacher has to say. He gets to choose his own work and materials and that makes him happy. And he is most definitely more advanced than kids his age in traditional schooling.