I seem to have the opposite experience of people in this thread. I'm down in southern California using Spectrum and they have by far the best rates. 100 Mbps for $40/mo. I suppose there is a lot more competition for internet out here than average though.
Is that just a promotional rate though? I live in Orange County and the list price for 100 Mbps is $65 (and my area has actual competition from FiOS).
The promo rates are good, but they'll expire after a year and unlike TWC, Spectrum won't just renew at promo rates forever. You either have to cancel and re-sign up, or just pay list price.
They just upped mine to 200Mbps at 40$/mo for free in the northern midwest. I went on their website and it was the advertised rate so I emailed there support and they restarted my modem. Make sure to check every once in a while!