As a general rule service only goes down. Rarely you will find a WG who is able to sustain good service over months or years; in London Stacy Nice Summer was one, Ellie Rose appears to be another, Smilie Cindy arguably a third. Most WG's quickly lose ground which is why experience often equates to poor value, and service usually drops over a series of meetings - at which time it is time to "retire" the regular and move on.