We moved to Bethesda especially for that school and neighborhood.
Our son has gone to K and 1st grade, and so far we have been very impressed with the resources at the school's disposal, as well as the involvement of the principal, vice-p, and every member of the staff.
My son had a classmate with Down Syndrome last year, and I saw the positive effect it had on him as well as other children in the class. At 6, he became more compassionate and understanding of differences, which is so incredibly important in our society.
Of course a minority of SN kids take up teachers' time and other valuable school resources - who would grudge it to them! My son has special needs that are addressed outside the classroom. But I do not observe that neurotypical children are significantly affected by this.
As for economic diversity, frankly I don't see much of it! I do not have the percentage of students who receive free or reduced meals in mind, but I suspect it is extremely low. I would not call Silver Spring a low income area, but of course there are those who do on DCUM.
In terms of ethnic diversity, there are some asian, hispanic and black families, in the midst of the paler-skinned student body
I do have one criticism: the classes are too large for one teacher (27 children). I feel this is a public school system problem, not specific to Bethesda ES.