What I'm most concerned about, as somebody switching back to a Windows Phone soon, is the apparent lack of a web interface for the OnHub. According to this page [1] the OnHub requires an Android or iOS device, with the app installed, to setup and configure the router. I don't blame Google for not supporting Windows Phone, the market share is still very low, but I'm not convinced that requiring an app instead of using a web interface like every other router is what I want from this.
[1]: https://on.google.com/hub/support/#get-started