I didn't go to boarding school (but in many ways wished at the time I could and now think home life would have been happier for it - or if troubled sibling had been sent!) but have known people who did.
Ex colleague who got a scholarship for 6th form - absolutely, wholeheartedly loved it (she'd hated home life and school and spent some time in a psychiatric ward due to pressures of both. :( ).
Ex boyfriend went from 14 - no good schools for GCSEs near where parents lived (not forces but had a job where you had to live abroad). Some of his friends had been there since they were 4 - including 1 whose parents were missionaries! :( He'd helped choose the school and it was near grandparents so they saw him for odd weekends (parents were 14+ hour flight) and he had a 'great' relationship with his parents. Although IMO he was very scared to critcize anything about them - like he felt on shaky footing with them.
Young relative of mine chose to go at 14. Interestingly (well to me anyway), they are a forces family and the mother had chosen to stay in UK for the kids schooling. So she and DH lived apart since oldest kid was 4, but they went to him for the long holidays and he usually came to them for 1 other holiday. Older DD was fine. Younger DS chose BS - he actively chose which school he went to and completely loved it. It gave him opportunities his DM wasn't interested in providing/supporting and gave him a 'male' support network that he needed. He still sees his school friends 10+ years after leaving. The only people who suffered in the situation were the parents. They went from a happy family to living separately just so the kids did not go to boarding school, but after 20 odd years living apart they found they couldn't live together full time - they were only used to the 'special', 'make an effort cos we only have 4 weeks together' bits of life. So even though kids have now left home, the parents still live how they did when they were there and their relationship seems strained. :(
Oh and I knew his girlfriend for a while (they met at the BS school) and she was worried about her Dsis who was still there and was in with a crowd of bitchy competitive girls who were into being anorexic. :( although no saying it couldn't have happened at other schools too.
Oh and another relative of mine works in a BS. She is a very, very active housemistress as well as class teacher. Her flat is open house to the sixth form girls and she has a steady flow of girls talking about being dumped, exam stress, missing parents... and whatever. From what she says it is hard work as she is always on call, but she loves the work and from what she says the kids are very happy in the school once they've settled in.
I'd say I'd never send DS (although if he doesn't stop batting my laptop with a cardboard tube I'll be investigating the ones for 3 year olds someone mentioned! Grrr!) but if it was the right opportunity for him then maybe...
as I do want the best education for him.
Oh and some of the ones mentioned on here sound amazing - I love the idea of stoppingat3 (hope I got username right!) seeing her DS every morning at pre-prep - bless! and the other one mentioned early on 1st page - own room? all mod cons? internet and tv? when can I move in? 