I’ve had good luck with Comcast in Colorado, though I use only their business-class ISP service. They’ve been extremely responsive to service calls. Heck, most calls respond with “we know there is a problem in your area and we are working on it now; would you like a call when it’s fixed”? Almost all of the outages are because wind storms or blizzards cause huge portions of ancient rotten cottenwoods to crash onto the cables in the vicinity. We also get a fair number of car crashes into power polls that take down the lines around here too for some reason.
When there is a rare problem at my end, they’re here in less than 24 hours, often same day, and fix whatever is wrong, usually with knowledgeable and personable repairmen. (It does help to lease the modem or modem/router, which eliminates finger-pointing.)
We use their consumer grade ISP service and it is extremely reliable. So... I don't have to call their tech support which can be 20 mins on a phone call with someone who is not that helpful or has to escalate it with 2nd tier group who may call you back within a couple of days.....