I was also in SH last week, may be we are in the same conference. I also visited this SN, the whole process was same as you described. They show me 7 BGs, all porkchops

, I was disappointed and they said it was all, as it is my first time there and I already changed clothes, I didn't know what will happen if I refuse and go, so I chose one out of the worst

, and do the standard procedure. When I above to go, the woman at the counter told me that the price was 650 with invoice and 600 without invoice, I paid 650 as I need the invoice so that I can claim money back from the company

, My conclusion is that I will never be there again.
The other one I visited is call "Eastern Yuen", the hardware is better and they shown me 3 BGs and 2 are eatable in my standard, and the price is 750, (higher price for higher quality), the BG was from ChongQing, 163cm with 33C tits and very smooth skins, the process is standard and the BGs is too skillful without GF feel.
My overall conclusion is SH is not a place to go for SN, better save money for DG.