Reviews of Proof School

I looked and the reviews are all a few years old. I am wondering if anyone sends their child to Proof school in San Francisco on the BART train? Do you like the school? Do they give a lot of homework? How did your middle schooler settle in? Is it a supportive community for the younger kids? I have a boy who is very into math and think it could be a good fit but would like a little more current feedback on the school. Thanks!