Game fly is it good? Worth it?

So i was watching tv and saw the promo code G4 and i tried it at gamefly.com and its the free 14 day trial but is it worth it. And after the trial ends what if i still have the game? Do i have to send it back. And Also after the trial will they automatically change to the packages or will it cancel by it self after the trial because after the trial i wont use gamefly anymore so i dont want to be paying for something i'm not using. Will they send me an email saying the trial ended and would you like to switch to a package? Because right now all i want is Black Ops and i really want to try it. And is it a good deal, how fast to ship it to new york for one game? And when they send it to me do they send it to me at my door or at the post office? Do i have to sign anything when receiving my package? Also give me any other information i need to know about gamefly like customer service and stuff.