My only problem with downloading it from iTunes is it's iTunes-proprietary and iTunes takes over your damn computer. If it were on Amazon (Amazon doesn't have series 5, probably because they go off BBCA, which doesn't have s5 yet), I'd be on it that way in a minute. And I have since they were released got the legal copies of s1-s4, so that the actors get paid (I do this with a lot of series, actually). But until iTunes' programming gets a lot more under control, I will not give Apple money.