My son is due to start in Sept. I chatted to another Mum at the bus-stop (when I saw her son in ESF Kindergarten uniform). She said that she was very happy with them. When I went for the tour I thought they had excellent spacious indoor and outdoor facilities. Well-trained and well-qualified, also have a nurse on-site.
I was initially a bit concerned about the bus ride from DB. But I think my son will love going through the tunnel twice a day. The only thing is that the school bus from/to DB only runs in the afternoons. He's three in July. He's going to quit his lunch-time sleep at some point, whether he continues at a kindergarten in DB or elsewhere.
The main reason why I am sending my son there is so that he has priority for interview at Discovery College, rather than being in the "lottery" system.