Meh. Cox isn't that great and I've been an customer of their internet service for over 16 years and my family has been a cable TV customer off and on for over 20 years.
While they have progressively increased speeds (and are finally supporting IPv6) they also steadily increase prices. The cost of my tier of service has nearly doubled over the last 15 years (but speeds have more than doubled.)
They used to (they might still) advertise only the first year promotional price for services without listing anywhere what you'll actually pay.
They're still not competitive with many of the fiber companies out there unless you don't actually care about cost. They do the same as the rest of the cable industry in that they skimp on upload to free up more bandwidth for download.
They have grouped up with AT&T to support legislation in states to block municipal ISPs because they like their incumbent duopoly. The city I used to live in is not allowed to charge less than Cox for municipal fiber service because that would apparently be anti-competitive.
If you actually do have downtime problems then, just like any ISP, you'll have a potentially bad time with glorified installers failing to troubleshoot the issue.
You're certainly not going to get an EE diagnosing problems for you and probably won't get the experienced people unless you're a nag or lucky.
They killed off their usenet service years ago which was unfortunate. They used to have a public website that informed users of maintenance and outages but they killed that and now you're just left guessing. My power company has a real-time outage street map which is amazing during hurricanes, I dream of Cox doing that one day.
Their website historically is slow and even goes down though they recently did a redesign that seems to be better. Maybe they finally paid someone to do it right.
In the cable TV arena they've jumped on the mini set-top box bandwagon where they "give" you a device for free but you have to rent it from them eventually.
Under the guise of freeing up more bandwidth they're moving to all digital encrypted service that requires these boxes when they could just as easily have used clearQAM and not required people to rent devices to watch basic service that they already pay for.
I honestly have a hard time saying Cox is any better than Comcast. I'm ambivalent. They could be worse and they could be a lot better.