I think the largest difference for me is in QoS, not in bandwidth. I generally use 802.11ac so I'm capped at 450mbps of the ~1000 available.

The service is always on, it's always stable, there's no weird routing or congestion latency at peak hours, it's just... functional.

That's what's miraculous about it to me - basically never needing to reset the router or reconfigure things. Internet as reliable as electricity. I literally don't even think about it.

Also the total cost difference is $45 a month for a far more satisfying experience.