Yeah, I got it, too, and signed up. From what I've read online, they're basically a scam, you get lower rates for about 3 months, then they slowly start raising the rates each month (hoping you don't notice and enjoy earning rewards points).
There's no contract involved, so it seems safe to sign up and then cancel a few months later if they start playing the rate game. (Compare your bill with a neighbor or friend to see what the "normal" rates are from the regular electric company each month,)