Binge watched it a little while back - thought it was brilliantly done, really impressed.
Read some criticisms of it in terms of accuracy, but really felt most of the deviations from strict historical accuracy were dramatically-justified. Though in the end I read so many contradictory accounts of what caused the disaster that I ended up more confused than I started. But in any case, it worked brilliantly as a bit of drama.
I liked the use of "equivalent accents". E.g the stroppy, cynical-about-the-boss-class miners being played by Scottish guys.