Years ago I met a mama who transferred his son from St Joe Wanchai at P5 to another school which, in my personal opinion, is less "prominent". She explained that her son had a lot of pressure because his class mistress 好興"一人犯錯、全班受罰" and the same class mistress would serve the same class at P6.
On the other hand, I know many kids who can cope well with the school life at St Joe. I guess it's a matching game - I just want to find a school that best matches with the personality and ability of my kid.