I've been on the campus, but I don't think I've been inside any of their buildings. It's right next to Malvern Prep.
It has a combination of boarding students (most of them) and day students (commuters) (about 30%). If I recall correctly, they are 6th grade through post-graduate. Oh, it's all boys.
The school is somewhat known for its really small class sizes, which allows a great deal of attention from the teachers. Many (I don't think all; not certain) of the students have a learning disability (usually rather minor), or just a nature that works best in a non-traditional classroom. Many of their students go to college, so the school is pretty popular with parents whose boys haven't done too well in a traditional school.
They also have put a good bit of effort into athletics, and have had their most success (I think) in basketball.
I've never seen Houser play -- I'm just giving some info on the school.