I have Cox Cable. For the most part it's reliable. When I do have a problem I'm usually on my own unless I get to the third level in tech support. The front line people always want you to unplug/reboot everything, which I have already done before I called them. If you have a wireless router, they want to blame every problem on it. Once they told me that my cable modem was shot and needed replacement. After I bought another one at their suggestion I found out that there was a service outage in my neighborhood. Fortunately the store where I bought the modem was good about taking it back.
My service is about $58 per month, so good luck staying at $40 and improving your service.