I went to Opium Thai last week with my wife. the restaurant was empty at dinner time, probably cause it was a Wednesday. Anyways, the first thing which was a negative was that they did not have a baby chair, we brought along our six month old daughter. So they are not baby friendly.
When it came to ordering, the staff was very helpful, they suggested good food. the hot n sour soup was really really nice. better than many restaurants. better than Yum! infact.
The black bean sauce was also very nice, except my wife didnt like the quail egg in it. it was boiled quail egg. it is supposed to be a delicacy. but the dish was very nice.
the desert was ok. wouldnt recommend that.
the bill came to around 1400/- per head, which i was not expecting. there was no left overs as well. so this i would say is heavy on the wallet