Well, I finished it. I got it from my mom at 8 PM Monday and finished at 1:25 PM Tuesday. (Yes, I did fit eight hours of sleep in there.) I'll be following the (Yay) Spoiler Free mandate, but let me just say, it was amazing. J.K. Rowling really outdid herself. A fitting end to a phenomenon, I think.
That, and it apparently switched on my writer's brain, because I pulled a chapter more or less out of a hat yesterday on my own work-in-progress. It's almost five thousand words and it doesn't make me want to die when I read it, so I'm calling it a success.