I do not send my child, but one of my neighbors sends her two girls, 16 and 7 and is a teacher there. It is a good school for some families, but you have to buy into the no tv, lack of consumerism, wooden toy culture. Your child will also have the same teacher for several years. This is good if your child has a good teacher, but bad if not. You also have to be pretty committed to it for the long haul, since they learn things on a different path, so it is not easy to transition back to a regular school without being ahead or behind in some areas.
Ultimately, it is just to out of the main stream for me, but I do like some of their ideas about imagination and story telling as a teaching tool.