OK can I just say, that as someone who took the Pottermore quiz five times (to see what would break the tie - I got Ravenclaw thrice and Gryffindor twice) as well as took millions of quizzes over the years and always got either of those two houses, I always assumed I was just another Hermione/McGonagall type and hatstalled between those two houses. And then I read all about Primary and Secondary and Burned and Model Houses and then I took this quiz - and it turns out I'm a Burned Slytherin Primary??? I was so shocked, but also so taken aback by the fact that I finally have the words to describe a pretty defining, nearly traumatic incident in my youth that I've come to realize (within the process of taking this test) defined me so much more than I've thought it did, and Burned Slytherin is just, it to a complete T. This quiz was like a therapy session honestly. (Also it turns out I'm a Ravenclaw Secondary and I'm really content with that, since Ravenclaw does speak to me a lot - and I might even model Hufflepuff Primary and Gryffindor Secondary, which was an intriguing thing to learn and something I want to learn more about). So yeah, wow, thank you for helping me, a very self-reflective introvert, discover something new and vital about herself.
ETA: Wanted to say that, 10 months later, I've taken the quiz again, and I've come out as a Burned Slytherin Primary, a Gryffindor Secondary, and a Ravenclaw Model for both Primary and Secondary, which makes the most sense to me now - and I'm looking forward to taking this again in the future to see if my self-understanding changes again lol! This quiz is always engaging and enlightening.