We're happy with AT&T gigabit service.
I don't know why they call it that, though.
We get 50-700 Mbps depending on the day.
We're usually around 500.
2 things to know:
1. AT&T monitors your activity unless you pay them not to. (If you believe it)
2. Data is not unlimited. They charge an over use at some point of data use. In your house, I'd get clarity on that.
That said, we have paid $70/mo since we got it, and that's what we agreed on. (Not plus tax, fees, etc., $70 even)
Service has some occasional hiccups but not as bad as TWC.
Install was free, they have good equipment.