Hi Groton Mom and Andover Mom, thanks for posting your experience. Why didn't you consider the gifted program of fairfax public school system, which can feed into TJ high school for the PG kids? MD also has Blair HS which is highly selective too. Wouldn't that beat sending your DCs to boarding schools?
Andover mom here. Thanks for asking. First of all, no offense, but I'd never live in Virginia. We're just Maryland people. So Fairfax was never even on radar screen. As for the MCPS magnets, yes, Blair an outstanding program--if you're a math / science kid. Child is not. Child is history/politics/social science kid. So that wasn't an option we even considered. In middle school the CTY/SET folks floated the idea of "elite boarding school" rather than early college as a better fit, but child wouldn't have been socially/emotionally ready as a 9th grader. We looked at local independent schools, applied to one--and waitlisted (not that we could really afford it anyway).
So child did pre-IB at an MCPS high school, but wanted wider horizons, the opportunity for in-depth discussion in classes not geared to AP or IB tests, and peers with passion in addition to being smart. Now child was ready, applied to Andover and was accepted to Andover for the junior or "upper" year. Child thrived, worked his/her *ss off, but found the intellectual freedom s/he was looking for. S/he's also made friends for life. As a family we're incredibly, incredibly grateful for the opportunity s/he was given. As Groton mom noted, it's not just the academics, but the whole wrap around experience. Yes we've the kid, but with technology, and longer breaks, we've dealt. It's been a perfect transition experience between high school at home and college.