My son had a place reserved at this school a couple of years ago. We didn't need it in the end though because he got into CRGS. If this hadn't been the case, he would definitely have gone to Colchester High. I really liked the school and so did my son. The principal was very welcoming and I felt that he had time for us and answered all our questions. The students were very polite and well mannered and there seemed to be a lot of money invested in the school at the time.
Colchester High had a really good feel about it. I knew I would like it before I had even walked in the door. There is nothing really grand about the school and it's not set in acres of land but it just seemed right for us.
My only concern was the lack of indoor and outdoor space. The hall is very small which is not ideal at lunchtimes and the playground is quite limiting. There is no field at the school but I don't think this has held them back with regard to playing sports as they use the Garrison.
My son would have got a very good education at this school. Class sizes are reasonably small and the curriculum is varied. I have no doubt that he would have done really well there.
There is no Sixth Form at Colchester High. Most of the students go on to study at Colchester Sixth Form so only five years of fees to pay (assuming you only have one child of course).
As you can probably gather, I would definitely recommend this school. I think your DS would be very happy there.