Wazzer, thanks for repairing my link.
In terms of comms I am usually 100% AW mail unless I am trying to organise a same day punt (which is very, very rare). I like AW mail because I can see if my mail is being read and there is a record of he said, she said. Once the punt is negotiated there is also a booking slip. With the nature of my job I very rarely get the opportunity to make discrete telephone calls, except from a hotel room at ten at night! So for the way I punt and the limitations of my life, AW mail is a god send. I make around 30 bookings a year this way and get one blow out a year. I believe I am reasonable in expecting a punt to go ahead if I have agreed on a time/duration/place/price, completed a booking slip, and mailed and confirmed twice on the day.
Would I go back? Myself No. I have few punting slots so reliability is everything for me.
LL should you keep her on your HL? If you can live with the possibility of unreliability I would recommend her as she is a very good punt - good location, top OWO, great body, a great GFE, which is why I was going back (something which is very rare). But for me she fails for being unreliable.