Hello,
I am currently an 8th grader attending TASIS England. I would highly recommend TASIS to anyone seeking an international school with an extremely strong emphasis on success both academically and athletically, as well as a high level of security and a beautiful campus. In response to the fact that you are considering ASL: don't. Although it may be more logistically suited, it does not have the same emphasis on team play, teacher-student relationships, and, of course, is more than half underground. Because of lack of space in central London, ASL organizers have had to build down instead of expanding. Therefore, students will potentially spend more than 50% of the day underground in windowless, artificially-lit classrooms, with the feeling of being imprisoned in a high security jail. TASIS, whilst being in a beautiful, remote location and consisting of beautiful Georgian buildings, is just as secure as ASL, and we have advantages such as the fact that we actually have outdoor athletic facilities located on-campus.
TASIS is also a much smaller community. We have roughly half as many students, and a student-teacher ratio of 7:1. Try beating that at any of the other international/American schools in the area.
And in addition to the reputation of our academics, our art offerings are to a much higher level than ASL or the other schools you are considering. And if my testimony of my education isn't quite enough to sway you in one direction, we constantly receive students from the ACS's and ASL, seeking a better academic program and a kinder ethos.