Must admit that I am influenced by the WGs voice. If she is friendly and seems quite enthusiastic then I will generally book her. If she sounds gruff, bored or just plain aggressive then I give it a miss. I have been wrong once a couple of years ago when I had a WG with a really high squeeky voice (a bit like a mouse). I thought that she sounded like a real odd ball and so I nearly give her a miss. But as it was a last minute booking and, I was hard up and it seemed a bargain at the time so I gave it a punt. As it turned out she was OK and I ended up having a really good session and a laugh.