My kids are at a school within a school. They do go to specials (art, music, PE) and recess/lunch with the traditional students. There seemed to be a lot more issues when the gt kids were in mixed-grade classes while the traditional students were not. This meant that the gt went to lunch, recess and specials with different grades every year. This had a huge isolating effect. Now the program has shifted to single grade classrooms the gt kids don't seem as insular. On the downside, they've lost the mentoring opportunities and some of the healthy ego-deflation that come with mixed-grades.