Thanks for the echo, yes once in one's life time. If you ask me whether I will go again, I may say that's enough unless it come across naturally.
The one I pick was really grade A compared with those in Hong Kong but with a bigger sized "sister" not good for Asian guys. Those Hong Kong western girls I tried before had smaller sized "sister" better fit Asian. perhaps the agent did a good job to select the girls for Hong Kong market :)