Keep in mind you may still have some guide problems like I have using HDHomerun tuners and Android/FireTV devices.
Also Tablo claims they are going to have an update that will allow you to run their new Tablo app experience on their older tuners. Not sure when or if it will really happen, and it will be optional. I also have a Tablo that I have tested using Channels DVR, but it wasn't totally reliable with Channels. For me Channels DVR has the best user interface design, but it does have a few bugs especially with Android/FireTV apps. They all recommend AppleTV devices for the best Channels DVR experience, but I am not going to stop using my FireTV Max devices.