I used Asiandolls last year, saw Yeona (reviewed as a Neutral). Overall I can't recommend the agency - though setting up the meeting was ok, the venue was basic and Yeona had such little English it was impossible to communicate properly with her. It was poor VFM. She certainly wasn't the woman in the pictures on the site - not that I expected her to be.
In my experience, if you want to meet a Chinese escort, best to book direct, if you want an Asian Agency stick to the Thai ones, especially Olinas.