Simply put, this is a gamechanger. Claremont and Byrne nailed it. Every x-men related book pays homage to this two issue storyline, and really, every modern marvel comic owes this issue a little bit of credit.
#38 – Uncanny X-Men 141
A dystopian future that was spelled out on a beyond-iconic cover, everybody’s dead. Wolverine’s popularity was only grown by his heroic ends that comes in this story, and I honestly can’t think of two better issues of comic books, period. Unbelievable. If you have not read this story, I don’t think you can consider yourself a fan. Canonical.
Completing Days of Future Past was one of the high points of my comic collecting days, that and having every Inferno related book.