Just binge watched this - was worried like Kittens because it is a favourite book - but it was GREAT!
There have been a few changes to (understandably) clarify/slim down the complexities of the storyline (I give no spoilers, but when you watch you will see why they did what they did), and a few more to make it palatable to an American audience, but it is well worth a watch and I loved it.
Most memorable line?
"Don't talk to me about the greater good, Sunshine - I'm the angel fucking Gabriel!"
Much better adaptation that I expected and casting was superb - especially Sheen and Tennant.
Enjoy!