My personal experience is that dr milton Leong is always very busy so that you maybe asked to cancel your appointment or see another doctor in his clinic. I booked appointment twice with him before but each time the nurse called and said he is busy and I needed to move my appointment. The third time I chose to see dr Doo in the same clinic. I also visited dr tay before and I think he is very nice. I live at the hk side and that's why I chose to stick with dr Doo at the end.