My experience is that they increase the speed, and then a few months later they raise the price. Then I have to switch to a lower speed to get a price similar to what I was paying before. It's dishonest and sleazy.
10 is slow enough that I'd have to watch my downloads if my wife or kid were streaming something, and saves just $21/month from the 30 package. When I started using them about 8 years ago, I was single, and my tier was about 15mbps for about $30. I think the lower tier was about 5 for $20. If there were a viable competitor in the area, I'd switch to them for a couple years, then come back to Cox as a new customer and get the discounted rates. No such luck.
It's comcast™