I used the cancellation trick and got a $20 credit per month over the next 12 months in exchange for a one-year commitment. More than covers the cost of the basic service. (I'd have to fork over an extra $100 for mobile/RZC, but I'll probably wait until I know I'm traveling on a gameday to do that.
Also, an added flourish: I mentioned to the guy that my wife was cracking down on bills, and that I needed to be able to sell it to her. He asked "does she like movies?" I said, "yes she does." And they gave me three free months of Showtime, too.
I'm sure some will get more out of them, but I'm still amazed this works year after year.