We really liked BE, but my youngest left in 2019 so I don't have any current info, although I believe the Principal Ms Seymour is still there (she's great). There was a great mix of families, and being foreigners, we particularly appreciated how many countries were represented there. My kids used the playground after school with their friends, we organized playdates and home birthday parties with them, etc. Quality of teachers was sometimes excellent, mostly good and sometimes terrible, like in all schools (my teens have been to two middle and two high schools since then). They didn't do activities at school, I ran the afternoon car service to various outside activities
What I love is living close to downtown Bethesda. I love the walkability, the metro, the restaurants and shops. I am from Europe and used to live in a capital city. This is better - less polluted, more human scale, but still feels urban. My kids still walk past BE regularly and can't believe "it's gotten so small". Ha!