As a lifelong horror fan, it's hard to find a film that gives you more than just a fleeting jump scare, but rather fills you with such a sense of dread that you will not soon forget it. Hereditary not only does that, it delivers some of the most disturbing visual imagery I have ever seen, and that's saying a lot. The sights (and sounds) from this will haunt you. The already impressive Toni Collette gives the performance of her career. I have seen comparisons to both The Witch and It Comes at Night, but Hereditary was infinitely better than both of those films.
It's interesting to see the no-budget indie flick that started the career of a filmmaker whose work you really, really dig. There are hints of genius in what could have easily been another Troma-tinged torture flick, along with some great style and witty satire of the NYC art scene. It also gives some context to see how much he has grown as a writer and director. If you're a fan of Saulnier and Macon Blair, watching this is kind of a no-brainer.