Was about to say..as b&s go...she is quite nice..
They often are. However it's against the punters' code to go through with it!

Seriously though, in my experience and based on what others have said, going through with a bait n switch is not advisable as its a key indicator of a shady outfit who are out to rip off punters. I.e if they're prepared to lie about which girl is working they will lie about services and it could well be a complete scam. So even if you are offered a hotter girl, you're unlikely to be able to fuck her for long before hearing her cries of, "finish, finish!".