For the first few episodes, I enjoyed this very much. A novel concept, great acting - especially from Anya Taylor-Joy - and very solid writing and directing. However, after a while, I started to realise why it reminded me so much of Mad Men: not simply that it is set during (roughly) the same time period, but because, at its heart, it is fundamentally hollow. The surface, yes, is very attractive (the period detail, decor, clothes etc. are great), but as the episodes progress, it becomes clear that there isn't anything more to the story than what we can predict right at the start. That is, this is a fairly standard story of a plucky outsider taking on the stuffy establishment we have seen in a million other dramas of this type. I also came to like the central character less and less. This is one of those dramas that treats its protagonist's talent basically as a superpower (think the BBC version of Sherlock), which means that everything comes to her far too easily, with no sense of the blood, sweat and tears that talented people in the real world have to expend to develop their skills. Having your main character occasionally leaf through a book while draped decoratively over a chair does not count! I also found it dragging in the second half of its run - it could easily have lost one or even two episodes from its running time. So ... definitely a worthwhile watch, but not the masterpiece some have suggested.