I have two Doorbirds, and I can say that the concept is a great one, but their implementation really sucks. The Doorbird app is often unresponsive and slow. When someone presses the button on the Doorbird intercom, it often takes far too long for the video feed to load, and opening is not always guaranteed to work. Our Doorbird is connected via ethernet cable to a router with a 100GB fibre connection, so it has to be the Doorbird servers. I've also seen situations where the Doorbird stations actually disappear for 5 minutes at a time for no apparent reason. The Doorbird support team is pretty much useless so you're on your own. Ultimately, the Doorbird system is a great concept, but is plagued by poor reliability and poor support.
