I've namechanged for this but I am a regular poster
Positives
My sons are at DH YR4 and YR. They are both doing well there. My older son is very involved in music - instrumental and singing. Sport is strong, they have good facilities and play regular fixtures against other schools such as Orley Farm, Sussex House etc.
DS1 struggled with reading and has had one on one and small group support from the learning support teachers at no extra cost. The school doesn't select for entry so is used to dealing with a range of abilities.
I have found the staff approachable and they do offer regular opportunities for parents to attend assemblies, see work etc.
The school is culturally diverse and although the school has a broadly Christian ethos its not overpowering (my sons are not Christian but DS1 happily sang in the choir for the carol service)
Negatives
On occasion the homework burden can be a bit heavy. Having said that I have agreed a more phased approach with the teachers if I felt DS1 was struggling.
No school canteen so it is packed lunches every day (I am used to this now).
School is split across 3 buildings with one set of playing fields about 5 mins walk away and the main sports fields 10-15 mins away.
Overall
It is a good school with a friendly atmosphere. The academic standards are high but being realistic they have to be that high if you want to get boys into schools like St Paul's, Merchant Taylors, Westminster etc. To some extent you have to accept there will be a fair degree of pressure later as the boys go up the school because Senior Schools expect such high results on the CE. Having said that, the pressure so far, has been well within my sons' capabilities i.e. things may stretch him but they don't overwhelm him.