DD1 went to a residential specialist speech and language school at 10, because even the language unit staff admitted her problems were so profound that nobody in the County knew how to teach her - and there were no secondary language units, so there was nowhere for her to go at 11. She loved the school after going there on assessment - because she recognised she was with people who understood her and it was an environment where she could cope. (She felt a failure in mainstream)
As Starlight says, and my mother said - DD1 got a proper childhood. After school, she had a snack after school, an activity like basketball, did her homework, had dinner, then another activity like football, and an hour's relaxation before bed. She was able to socialise with the other 80 plus children in the school. She came home every weekend, out of choice. She was very happy.
Monday - Friday, I was able to spend more time with DS and DD2, who had suffered the most from lack of attention. We all got respite; there was no more fighting and stress with the LA, because once the out of county decision had been made, that was it. No problems with mainstream schools, who don't understand or are constantly using dc's provision for something else.
We are at the stage now, due to her developing other problems, that we cannot cope with her for more than a few weeks. The fact she is at a residential college means she comes home, when we have had respite, have recouped our energy and can spend quality time with her. She has a really good time at home, instead of us all sleepwalking around, in a frazzled state the whole time. The chief ed psy there says to us - "She is safe here and at least she still has a home to come to!"
Sometimes, its a case of firm loving - considering the needs of the whole family and especially the siblings; and not feeling guilty because you cannot meet the needs of the SEN child. Its only the other end of the spectrum, of families who have to put an elderly parent in a residential home, because they simply cannot cope with working full time, looking after the children and the frail parent with disabilities. We are not superhuman; and its better to choose a residential school, than the family breaking down - which happens.