It's not speed that matters to me as much as service quality. 50/10 is fine speed wise but when it cuts out is when I wish Comcast had real competition.
Even a cable TV overbuilder coming to town would be nice. I lived in an area with an overbuilder in town and cable TV is at least $20 per month cheaper in overbuilder towns (I know this firsthand).
My Internet is good when it works but getting them to fix things is as fun as getting teeth pulled. The techs are useless.
If they had competition, things would be better. -- I've experienced ImOn (when they were McLeod USA), Mediacom, Comcast, and Time Warner and I currently have DirecTV. They are much better than broadcast TV.