Internet and landline quality are excellent and rarely go down. However, billing has exceeded inflation, often duplicitous, and support for tech upgrades is unreliable and sometimes just wrong. I love the reliability of Comcast's services, but dealing with them is such a pain I am looking for alternatives, even to the point of reconsidering (gasp!) CenturyLink which, having had previous customer experience with THEM as both Qwest and CL, until recently I would never have considered.

When my aspect ratio went, they told me i needed to upgrade my boxes. They said they wouldn't charge me any extra monthly fee because I'd been with them for 32 years, but when my next bill came they were charging me $15 extra each month and they refused to refund it.

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There again they have the monopoly. For the services I have I think they are doing the best they can. Somebody can come out and, I had a fantastic person come out and helped me with some stuff who was sort of a trouble shooter and didn't have just sort of an agenda, he really caught playing through and was trying to figure out what my problem was and was fantastic. And then I've had the opposite where I've had somebody here every week for the same problem and it just doesn't get resolved. And then the whole time I'm paying for the internet service but I'm not getting it.

I would tell them that their telephone service is the worst in the industry. They are the most rude in the industry. They are the most unhelpful in the industry and they are the most unreliable in the area.

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The service was fair and I would use them again in the future sine we are not planning of changing .

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We had an issue with the cable modem.  We called for technical support, and we ended up getting upgraded to a new services package.  While the issue was resolved in a satisfactory period of time, one of the technical support callbacks was handled with an English-as-a-second-language barrier, during which time we got upgraded to a new services level.  When we received the self-install kit (very quickly, I would add), we were dismayed that the upgrading process concept hadn't been described well enough.  It was difficult to self-install, but we did so, fearing calling in would net another ESL issue, and we're not so rude as to hang up on a rep for that.

The service appears to be working well, now, for which we are happy.

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Problems usually resolved at their end

We have been using the company for about 1 year.

We have had continued connection problems for over six weeks with our cable TV, our internet and our telephone. in the last three weeks Comcast has sent four different technicians to our home. Two appointments were made for technicians to come into our house and those two technicians both scheduled repair services to come and work on the equipment in our street. All four of those technicians have acknowledged that the problem is not in our home but is in the Comcast equipment in our street in our neighborhood. Comcast continues to insist that we be home when they next arrive to try and repair the problem. Therefore we have to wait another 5 days for a possible repair. Twice I have asked to speak with supervisors but after waiting on hold for a good long time both times I was told they were all still busy but one would call me back the next day and then after my last request, that I would get a call back within two hours. It has been 3 days since my last request and still no supervisor has us called back. Representatives hung up on us on two different occasions. Initially I was on hold for one hour and twenty four minutes on my cell phone. After I'd been on hold almost an hour my husband called on his cell phone and he got through before my call got through.  The computer system that answers the phone is very time consuming.  it has told me that my internet can not be recycled. It does not allow me to stay on hold, but tells me to leave a message and says that I will get a call back from a live representative but then the computer system will call back and state that all representatives are busy. We never do receive a call back from anyone.  Attempting to get through to this company for service and repair has been time consuming and unproductive. The Comcast website gives me no option to contact the company in writing. When I call to report our internet is out, their computer tells me to go to their website.  The third time I contacted Comcast, the representative said they would double my internet speed for a year at no additional cost but first I need the internet to work. I don't need faster internet. We just need consistent operation of the services we pay for. We have followed the directions of the technicians but the phone staff is unresponsive. My time is not respected.

up.   All spoke english and understood me wellYes but a friend said she was not so lucky.

Like AT&T before the breakup, they don't care, they don't have to. I dislike about everything about the company. They have fairly consistent service, but they have lousy customer service. They are aggressive and expensive. Their attitude is bad.

I Have had Comcast TV and internet for maybe just over a year. The
internet was never great, the internet fluctuated, it streamed videos in
lower quality even though I got the upgraded speed blasts, and the TV
was always okay, despite the onscreen guide interface having a Graphic
User Interface that looks like it is from the 90's, and an, almost
infuriating way to search on demand videos and create play lists. 
 
However, I had never really had a major problem until a week ago when for some reason, the cable wire fell from the house. Upon later inspection it was just not installed properly or attached to the house in a safe or proper manner. The wire fell and was frayed and attached to rusted hooks, it was laying across the wet grass and a concrete sidewalk, but was still attached to the utility pole on one end and my house on the other end. It was a major safety hazard, Comcast customer service was not helpful and they said they could get someone out there by Sunday to fix the hazardous situation. By the way that is a full three days after the date I called. Worried that someone would trip over the wire, get hurt, or possibly shocked (although i know the risk of shock is low with cable, but it was still attached to the utility pole so I was afraid to touch it) I tried requesting service online with a chat. I got another ticket number, they also said the soonest they could get someone out there was in three days, and they suggested I call the power company to inspect the safety of the wire, which I didn't think was fair since it was clearly their issue. I called the power company and the dispatcher I spoke to sighed when I told her Comcast said they would check on the hazardous situation in THREE DAYS, and implied that this happens frequently. someone from the power company came out within 15 minutes and hung the wire up with a temporary hook high enough off the ground that it didn't pose a safety hazard.
The tech came on Sunday and added another hook to the house. He was asked to check to make sure it was working, and he said 'yep' and left. However, when I tried to turn on the TV and the itnernet the services were still not working. I called back again immediately and said someone could come out on Wednesday, and I said I work during the week so it would have to be after 4pm. he said that was fine, and then I got an email confirmation saying that they scheduled an appointment from 10am-12pm. Whcih is an impossible time for me to be home.
Seriously an awful awful company. I can't believe how neglectful they are, especially to a very hazardous situation, that could have left me viable for a lawsuit, (I'm sure they wouldn't have been responsible there is probably something in the ToS that says they aren't responsible for anything even if it's their own fault and neglect.)
I'm trying hard to find a company to replace them with, but unfortunately Century Link is also one of the worst companies in the country for internet. Comcast rates Second from last in dissatisfaction and now I know why. I miss having Verizon FiOS, sure Verizon is probably not the best company either, but they are ranked Third from the top for customer satisfaction and customer service and the internet is a steady quality, it doesn't violently fluctuate in speeds and  the television is higher quality too. Unfortunately Comcast is a monopoly and quality competitors are far and few between.

poor service

We had to return two converter boxes. The third one finally worked. In between, we spent several hours on the telephone with (always very polite) technical support staff. On each return we were in line at Comcast locations behind a dozen other people also returning defective boxes.
The internet still didn't work and eventually needed a service visit to the house to fix something they'd argued on the phone wasn't broken.

I've had Comcast Business for a long time - enough to ride out my contract and have them start charging me extra.
Once my Cable TV contract ended, they started bumping the price up $10 a month, for several months in a row. We went from $49 to $99 before ultimately canceling. The reps refused to re-bundle our package, refused to help and could have cared less when I said I was going to cancel.
I am also a subscriber to their Business Class internet access. Service is reasonable, but the price, again, is going up and up. First, it was my monthly fee, now it's my 5-IP package. $15 extra, EVERY MONTH, for my 5 IP's. That's on top of the $10 extra a month that they've charged for the internet access.
I'm done. I do not recommend you go with Comcast, as they'll just start bumping the prices up once your contract is up. Reps don't care, as they hear this dozens of times a day from many many customers. Find someone else, if you can.