I have a relative who teaches there and sends her children there too.
I believe it to be a fantastic school. The children are very happy and are making progress as individuals. The older child is shy, academic and into the arts and the younger child is outgoing,struggles with some lessons and is very sporty. They are both being encouraged and helped in the right direction for them. The school, from my distant perspective, seems to be doing a great job of seeing children as individuals.
The class sizes are quite small, the grounds are beautiful and the facilities are, I think, very good (2 Astros, a swimming pool, a golf course, sports hall/theatre, outdoor theatre, dedicated music, art, science and technology rooms/departments).
The school is non selective and has a huge ability range but the record of results for the leavers is very good. A few children leave at 11+ for Aylesbury or Buckingham grammars or independents like Berkhamsted. Most stay to 13 and go to a range of schools, the most popular being Stowe, Oundle, Uppingham, Akeley Wood, Berkhamsted, Bedford Modern, Bedford Boys, St Edwards Oxford, Repton, Bloxham, Bradfield, Headington, Abingdon, Magdalen, Rugby and Radley.
I can't recommend it enough. I go to everything I can get to and, if I didn't live in London, my own children would join their cousins in a heartbeat.