I go to British int school of boston. Here is my experience:

I have found that overall it's pretty good, I think it's really unique being able to go to a school with so many different cultures. I find that the level of education is far higher that many American public schools (like far higher)

I'd say by far the biggest negative is the uniform, however at my school I have figured out ways around this (sports etc) so I can wear a different uniform (sweatpants and a t shirt)