I use this service now. If you only watch a handful of cable channels, then I think the service is great. We use Roku to stream it (as it doesn't support Apple TV or Fire TV, both of which I'd prefer). The app works well enough, except for a frame rate inconsistency that I notice from time to time, but only if I look for it. Only the Spectrum app seems to do this for me. Not sure if it's only the Spectrum+Roku that does it or other devices as well.
The real benefit of this service is the access to all the streaming apps of the channels themselves. When you consider the entire streaming catalog of 10 channels of your choice + major network catalogs + 5 premium channel catalogs (optional, but for $15 it's a steal), all available on nearly any device, it's pretty great.