I have a 1st grader at Beall. We've generally been happy, and most of our complaints are MCPS policy type issues, not specific to this school.
I agree with PP that it is a great community with quite a few active parents. I'd say most (60-70%?) of the elementary aged kids in the neighborhood attend Beall, but there are also quite a few in Catholic school or other MCPS schools ( language immersion, COSA, HGC, certain special ed).