Anyone used ExclusiveModelIntroductions.com?

Excellent!  Very easy to deal with and professional.

I haven't yet had the opportunity to work with these folks - their schedule and my schedule haven't matched.  But, I've had several conversations with them, and they seem to be legit.  Meisha seems very open and interested in matching up providers with hobbyists for a good time.  They do seem to get some really excellent ladies touring in the NYC area (where I am) and one of these days, the ladies I want to see will be in NYC when I'm able to see them and I'll be able to give you a better answer about this agency.