OK, I'm going to bite the bullet here. First off ... this is MY OPINION ONLY!!!! It has to do w/MY personal decisions.
We have a few schools similar to this in my area. We even looked at one just out of curiousity sake. When I saw no structure in the curriculum, and that not all curriculum was met in the school year, I said no way. I know my child and know that he needs structure. This is JUST ME. I am not saying that my decision is right for everyone ... but you have to know your child.
Some children can take this settting and flourish. Others cannot and need more structure/format/guidelines. Some children can take things and "run" with them ... others need structure/guidelines. In one of the descriptions (under "Learning - Experiencing Life"), it states "Things are almost never quiet, and the atmosphere is electric with enthusiasm, but not chaotic or frenetic." Some children cannot work in an environment that is so charged. Others thrive in it.
I think that my main concern would be that my child learns what he needs to know to succeed in life. While it's great to engage in baking cakes, having heated discussions, poking at pottery in the art class ... are the basics being covered? Seriously -- are they teaching the basics? And, how well are they covered? If someone chooses to rarely participate in Math b/c it's "not what they want to do", then what will happen when it's time to go to high school?
Today, I had a Kdg. student tell me that her mom was going to be mad at me b/c I made her do "lots of work" today. After a few tasks, she said she wasn't going to do any more work. I told her that whatever was not finished in class would become homework b/c she was the only one who had a problem dealing w/working. Well, after a 5 day vacation, of course a regular school day seems like work. I am sure this child would have loved this school to "chill out" and "take the day off" today b/c she didn't feel like working.
I can appreciate a school like this ... but know that it isn't right for MY child. If it's right for your child, then super and I'm honestly thrilled for you! My point is that you have to know your child and know what their needs are, education wise.