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I have a friend whose D went to MBU at around 15. Honestly, it wasn't a good experience and the parents wished in retrospect that they hadn't done it. Their kid thrashed for a few years after getting out, although seems stable with an adult job some years later. I think looking back the parents felt like a more regular college experience in her late teens/early 20s would have been a better investment and better for her.
I had a kid who could have gone -- but we decided to keep her in a local independent private school. She attended the Davidson THINK program for a couple of summers, and was a high performer in academic ECs like Quiz Bowl & science olympiads. She took up club fencing, and met some more intellectual friends there. She picked the hardest college (and hardest major) she could find when it was time for college, and it has worked out well for her.