I attended a couple of information sessions for a new one. I suggest specifically asking about gifted education; they will likely tell you that they work at the student's rate and can accommodate his depth, but I don't know how they will answer your gifted-specific questions. Some of that will depend on the teachers they hire. Look at their various locations and the faculty bios should be available. The faculty in your area may vary. They do not offer AP, but do offer Honors level.
The parents' reasons for considering the school varied widely!
I am still considering it for credit makeup if necessary, and am going to start talking to our counselor to permit the credit Transfer back to our school. My concern is that I believe we will need a teacher with certain training, and don't know if it will be a good match.