I have Verizon DSL.
It routinely warns me that I have a cable disconnected. (8 - 12 times an hour)
It periodically requires a complete power cycling of everything to re-establish contact with the Internet.
It takes it's bloody fool time exchanging information at times. Saturday, in the chat room. it seemed to take a good five minutes to recognize that I had pushed an enter key. I've had a couple of posts where I spent time editing them, only to have them completely disappear.
I haven't really noticed any difference in transfer speed, only that it doesn't take an hour to access the net and two of us can be on at once. The ability to use the telephone probably makes it worth the cost, although in the past I have relied on using two telephone lines.
Overall. I've used Internet connections at colleges, in factories, and at the library. The service we get at home isn't impressing me in the least.