Currently, there is only one device that is on the market that supports ATSC 3.0 - the SiliconDust HDHomerun 4K. That being said, I live in Austin, TX, and they are “live” with 4 stations, but they are “rebroadcasts” of the original HD programming, only difference is AC-4 audio (instead of AC-3). Many devices lack support for AC-4 audio at this time - and the 3rd party DVR apps don’t support ATSC 3.0 broadcasts.
I have the tuner, and it isn’t ready for “prime-time” as of today. I still use my Tablo DVRs for all my recordings. And in the near future (probably the next 1-2 years), I don’t see that changing. There are too many issues out there between the broadcasters issues, the tuners having issues and the DVRs that don’t support the new codecs required for ATSC 3.0.