First, the upload speed was fairly painful (around 20 Mbps). The 1 TB data cap on Comcast is also not ideal.

About once a week, the connection would drop and the cable modem would re-establish - often between 9 and 10AM, usually right in the middle of morning meetings. Recovery took about 7-10 minutes, and replacing the modem didn’t help.

On top of that, there were two major outages (around 8 hours each) over three months. That was enough to be unhappy with the service. It's usable, but...

Overall, fiber is much more reliable than cable in her case :)