DH has relatively small classes (16-18 in many classes) which is very beneficial for some children thanks to a great parent-teacher ratio. Yes some classes are located on the lower ground floors of the building but they have large windows and get plenty of sunlight. Size-wise the classes are not huge but good for classes under 20. Food and catering is excellent.
There have been some ups and downs especially during CODID years (like in many other schools regardless sate or private) and the school has got a new owners/head at the same time so it was a big shakeup.... its a bit too early to have a firm answer but so far the experience with the school following its takeover by dukes has started to improve. they have put more emphasis on sport, facilities, etc. the parent-school communication has improved, and the new head has been generally pleasant and certainly feels like is is involved
its a pity the school and the new head is getting a bit of hatred on mumsnet especially from people with no first hand experience. the fact that the school is being run by a large private group is far from being ideal but may not necessarily be a bad thing thanks to economy of scale as these type of schools are more viable.
In terms of the leavers destinations...its a mixed abilities school, so expect some mixed results . also given they are non- selective and co-ed they have a large proportion of expat families who may not be "in a game" for 11+/13+ exam prep by the time they join the school/or may not put too much efforts into it.
and its true that a good proportion of children leaves at 4+ as many families use them as a nursery and then move to state or try their luck at the selective private schools, others leave at 7+. this is totally normal for non-selective school.