DH actually lived in Japan for 3 years while he was in intermediate school. It was an incredible learning experience for him, and he wouldn't have changed it for anything. The first 6 months or so was difficult and quite an adjustment, but they all did adjust and came to really enjoy being in a completely different culture. The education was also superior to what he would have gotten had his family not moved. When they returned to the states, he was way ahead of his classmates.
If we were offered the opportunity, I probably wouldn't be real happy about it and would hate to leave my family and friends and home. I'd go anyway though, knowing what a once in a lifetime opportunity it would be for my kids, IF there was some way of getting around the boarding school. The boarding school would be the only sticking point for us, but no way, no how, would we send our kids off to live in a dormitory in a foreign country.