It's crazy how opposite exeriences happen depending on area. I had AT&T Gigapower and it was the worst Internet of all time. They must have been at my house 6 different times, always to tell me my wiring and line are "perfect" and there are zero issues. I told them it has to be the station outside my house and it was like an act of God for engineering to come look at the central station. "Not enough people complain" for them to come do it.
They told me they don't guarantee WiFi and only guaranteed hard wired connection, which I still had issues with in the testing I did even while connected with a network cable.
I 100% know I had a problem because in timed games like Chess, I was losing time every move because of the intermittent issue and lag. I also did tracert and ping tests and would constantly get time outs and long latency. I showed them this and I might as well have been speaking Greek.
I always tested good internet speeds, but my issue was latency and the connection dropping. Replaced my equipment multiple times too.
I switched to Spectrum and only have 400mbps down now, but consistently get 500mbps and it is PERFECT. Consistent, no lag, and my latency is cut in half. I'm also paying $39.99/month with Spectrum versus $70/month with ATT.