I strongly disagree with this 'try before you buy' business. If you want to watch something before buying it, you have 3 options. Wait for it air on TV, rent it, or borrow it from someone. You shouldn't get to own an illegal copy of it. Let's assume you decide then not to buy it because you weren't happy with the entire set, are you going to delete your downloaded version? If there's a couple of episodes you like, you may delete the rest and just keep those episodes. Even if you do that, you still have illegal copies of something you didn't pay for...