The wife and I are 5 episodes in and so far its excellent, but there's a few things you should know before jumping in, spoiler free.
Number one is this show is not historically accurate in anyway and that's okay, but you should know that. The only true thing about this show is that slavery existed and there was an "underground railroad", but that is not accurately represented.
The Underground Railroad in this show is a literal railroad and in the historical sense it was not, but rather used as a way to secretly communicate the movement of runaway slaves to the north. There are also several other historical inaccuracies, but again that's okay as long as you look at the show as a complete work of fiction that has SOME historical context.
That being said, the show is excellent when you omit historical accuracy. Its a great work of fiction with good acting, cinematography, directing and writing. Very enjoyable and look forward to seeing the end of the story.