Uses regular phone lines which are cheap and commonly available
Moving color image
Relatively cheap price (8x8 ViaTV).
Cons:
Compatibility: you need one on each end of the line.
Slowish frame rate
Ease of use. Familiar technology: your basic telephone
Regular phone lines
Portability
Sends still black and white image
Cons:
Need one on each end of the line
Not available anymore... If you have one, give us a call! :)