Absolutely love it. As a huge fan of the books and the original BBC series, I had low hopes and was honestly just praying it wouldn't be awful. How wrong I was. It's brilliant!
Yes they've gone away from the books a bit, both in the detail of the stories and some character ages, prominence and backstory (the original being absolutely true to them), but that just stops it being a slavish copy of the original adaptation, which if you think about it would have been a bit pointless really.
It's beautifully acted and shot, and an absolute joy to watch and retains the essential joy, warmth, scenery and spirit of the books. Best of all my whole family absolutely love it, my kids are the same age I was when the BBC version came out, and they are as gripped as I was, which is lovely.
Samuel West somehow nails the mercurial Siegfried, in a new way, though it took a couple of episodes imho, and I could never imagine anyone else doing that after Robert Hardy. And Nicholas Ralph makes (dare I say it) a Herriot more like mind's eye saw him than in the BBC series.
Please, please commission a second series! And if you havent read the books, what are you waiting for?