Dr Wong is a kind and humorous doctor. He is patient and willing to answer all your questions. But like every other OB, you got to wait for like around an hour.
He charged very reasonable. I remembered including supplement (vitamins + folic acids), consultation and 4D ultrasound, he charged around HK$420 when I visited him last year.
You can ask him to record scan in DVD. If I haven't remembered wrongly, this service is free and what you need to do is to bring the disc back everytime.