I'm in the RM cluster, too. My eldest is at RM, not in the IB program, and it's really not the chaotic, inner-city nightmare some people seem to make it out to be

.
She takes a robust selection of AP classes and is doing well. I'm completely not worried about her safety or her chances at a decent college.
Same goes for our neighborhood. We've been there for almost a decade and have experienced no crime. I never feel unsafe, either for myself or for my children.
Hey, I like Kensington a lot. When we were looking at houses, our final choice was between one in Kensington and the one we bought in Rockville. Honestly, you'll be fine either way.