Okay, I have cable internet and it's super-fast, but the rates in my area are about to go up YET AGAIN!

I am considering switching to DSL, I can get it through AT&T and a good rate. The question is, what is the real difference speedwise? I have always had cable internet, so I want to know if cable is worth the money, or if I should make the switch to DSL. Any advice would be appreciated...