There appears to be an undisclosed maximum of ten devices you may add to your segmented guest (or in my case, IoT) network. This app also replaces your ability to configure your router via web portal since the router is regularly flashed remotely, overwriting whatever configs you have there. Heck, you can't even disable wifi on the router anymore! Buy a secondary router, or better yet use a different provider that doesn't limit the flexibility of your network.