https://www.cnet.com/news/testing-verizons-new-5g-speeds-exposed-three-major-issues-with-the-next-gen-network/

At times, the 5G speeds recorded by the Speedtest.net benchmarking test got us the 600+Mbps download speeds Verizon has promised. Other times it was closer to to 200Mbps range, and still other times, the phone professed to be on 5G, but acted a lot like 4G. I had a battalion of upload and download tests I was going to try Thursday in downtown Chicago, but it was so hard to keep a 5G connection long enough to run the most basic tests, I had to throw those plans out the window.  

That's not a great start, and it indicates that something isn't working well -- the network, the phone, the Moto Mod attachment or the way they all communicate. It's an awkward place to be  for a network boasting to be the world's first live 5G network.