Remember, if you ever post any 411's asking for feedback, search the board first and also the review section.  Another good strategy is to google their phone number and see what comes up.  If you see pages of listings with different names and no reviews, red flag, or an indication to do a little more research.  Many girls have different names for different ads (marketing purposes) and some do that because they do not provide good service and have to re-invent themselves when they develope a bad reuptation under a particular name.