Hello Bela65,
I went to see Dr Lam Yung Hang for a doppler because my Obst, Lucy Lord wanted to check the state of my placenta at 37 weeks (baby had stopped to grow for a week so she wanted to be sure that he was still getting some food).
He was neither nice or warm but he was very professionnal.
Althought I would not go there every month (women in the waiting room were so sad, and all seemed sick, I was so tensed after 15mn waiting that I told the secretary to call me on my mobile when it would be my turn and I went to wait in the street so I wouldn't see all this crying women!), I must admit that the exam (doppler = ultrasound but he takes his time to really look every detail of what's happening inside) was done very precisely.
In France where I come from, you have to have a precise ultrasound at 3, 5 and 9 months I think I will keep that habit to do it even if my obstetrician, Lucy Lord doesnt prescribe it and I will definitly go back to Dr LHY.
I hope I answered to your questions even if I've been very long ;-)