My understanding is that they're heavy on homework there and possibly rigid about every child being gifted. I could be wrong there; maybe it was Stratford that says that every child is gifted. But they both have high homework loads.
Harker is expensive and super-intensive but good for gifties. But my understanding from a fair number of parents (6 or more) and one student my son's age is that it's very, very intensive. The student's stories put my son off it completely and a parent told me that you have to accept that Harker is your life. Her kid was in the middle school at the time.
Sent you a PM.