Some of them are real deal
it's better if you can read reviews (in Chinese)
I tried 2 of them (one of them retired/gone) the other one is this
http://www.sex141.com/php-en/memberDetail.php?id=30
I got fs, and BBBJ from her for the price listed. great bod, long legs and natural C cups. good kegal skills as well.
but as she told me, the service the girls provide is highly YMMV. SSOG basically, you get there (very tiny suite), they take you to they shower (ususally they would wash you up), and then do the deed. You get another shower (and groping) and then get dressed, pay your donation and off you go.
you can't prebook these girls in private buildings as a result sometimes you see line up 1 -2 pooners (ususally I just walk by and find someone else), you can book the ones listed in hotels.
These places ususally located in private buildings and are monitored by gangster with security camera in the hallway (not in the room don't worry). a bit scary at first but they mainly use it to protect the girls from rapists. Btw, LE there don't ususally bust these premises. I've heard people getting their id checked by LE and was let go to continue surfing the building.
Interesting experience definately visiting her again when I go back to hk.