I have Roadrunner through TWC internet only. I pay $30/month for 15/2 and it is normally $50/month. My speeds are consistantly between 20 and 30 down without the powerboost. The boost will get me up to 50 for a few seconds. This is probably because I am the only one around still using TWC for internet. Everyone else is using FiOs, DSL, or some other VoIP company. This is also why I have not paid full price for internet in over 5 years. Every time my annual discount expires I call them up and tell them I am going to FiOs and they give me another $20/month off for a year
That's what I do. When the promo is up I call or send them a message on Twitter and they usually put me back on the promo.