Voice quality can be very good

• VoIP to VoIP can have broader spectrum

  • You can hear the S's and F's better for example

• Good quality components such as USB headsets also help

IM is available during a call on some services

• If of course both parties are on computers or perhaps certain PDAs

Negatives: Voice quality can be realllly bad, too.. No HAC computer USB headsets (?) so far