Hi guys. I had a similar experience to VBB: Natalie recommended Alexa, and it was just an awful experience.
I tried Anita. She's more friendly than Alexa, but so restrictive that it wasn't even remotely fun or erotic. About 10 minutes into the session I got up, got dressed and paid her a "kill fee." Maybe she's improved since then (summer.)
I understand from Natalie that she and Alexa had a falling out. I believe Alexa was answering the phone pretending to be Natalie -- that was part of the problem. Hope this helps.
Cheers,
Mel