Redundant in my eyes.
You already have a lot of more mature services like Facetime, Skype etc. on OS X.
dog pile.
Skype drops so often nowadays. its screen sharing feature plummeted on mac since you can't share a specific window, but instead only the entire screen.
i used to screencast often, to watch films and share music.
viber is more reliable than skype on the iPad/Pod/Mac.
i am excited for this software, even if it is initially buggy, its clear the makers are passionate about these features that are lacking in skype.
clearly the objective of the app is about sharing - sharing music, tv, film, or any content on our computers. and its intention is clearly to do this better than skype's offering.
skype is a lazy effort, and since microsoft took over, its not been getting better.
facetime is irrelevant. for the same reasons as skype, its just BASIC. its another 'BASIC' essential by apple, much like iChat and iMessage. Messages doesn't even work well on the Mac at the moment, and Apple don't seem that interested in getting us users being able to talk to most or all users from all kinds of IM services, like Skype/MSN.
apple don't care about the same things that Rabbit seem to care about. i may be part of a minority, but that minority certainly will show that this effort and app called Rabbit isn't as redundant as you feel.
perhaps speak for yourself more often - its redundant to you because perhaps you have no interest in the sharing features.