Its a good deal but if you only want the trial and have no intention of carrying on after the 3 months make sure you cancel straight after you've signed up.
I had murder with Amazon Prime similar thing. Although I took the months trial up and cancelled straight after and got their confirmation email they still took a months after the trial ended, I had to claim it back and Amazons excuse? I needed to confirm it again...like wtf is once not enough ??