I am fine using Skype. However, I would tend to favor a written chat, as it is less sensitive to bandwith issues, it can be followed from a cafe or library, and it is easy to archive for later consultation (in particular for those who can't attend to the chat).
I have never Skyped - personally - although I have been nearby. I may need some talking through it. The power is out due to one of those wonderful West Michigan thunderstorms, but I will look into it more when I get power back or when I can get WiFi and an outlet. The battery will only last so long! 10:00 am - 10:00 pm EST would be fine for me, unless I have a shift to work that day.