It's the kind of thing you use once or twice because it seems 'cool' but in day to day life there is really no practical application for it.
TOTALLY disagree with this post. If you travel, if you have distant family or friends you want to keep in touch with, if you have people overseas, it's really a lifeline. I use it a lot to talk to my kids and friends, for time spent on the road, and just to 'see' some of the things that people can only describe or talk about. "Hey daddy, I lost my tooth- see?!" "Look at our new puppy!" The list goes on and on.
Don't mean to sound like a commercial, but I think it's a cool little feature.