I have finished season 1 and loved how it progressed. Usually, I lose interest about halfway through, or something happens and I discover it was a character I liked who for whatever reason leaves the story and so don't want to watch any more. But this series is great from beginning to end. The only thing I didn't like was that at near the end the dog gets killed.
It isn't that bad, really, and nothing is shown. But even with that teeny-tiny scene it would be a shame to miss watching it. If you're sensitive about things like this as I am just fast forward when you see Demelza usher the dog out the door at the end of part 15.