Love this camera. Got one for my parents to watch their grandkid on their ipad. This is much better than facetime since they don't have to have someone answer their call just to watch the baby. You can even talk from the app to the camera, but it's not full duplex and the implementation is clunky. You have to hit the mic icon, wait for it to be ready, speak, and hit it again before you can listen again. Depending on your network response, you can spend a minute hitting the mic over and over and there is a 3 second lag.
There is a $24.95 additional charge for the app to open it up, which should really be in the description of the product.
Overall though, being able to tune into the camera from any location from an app is pretty awesome, though there are some refinements that need to be put in place. if you're easily frustrated this might not be for you.