Just had my interview today.
It was a combo I-751 and N-400, but the I-751 part was very short and easy (generally just questions how we met, we both answered that describing the story). They said the documentation we supplied when we sent original I-751 was sufficient and did not need anything else (I did submit some most recent bank statements, phone plans etc to the N400 application online a few days before the interview though).
Then, my wife was asked to step back a bit, and we proceeded with the civics test and reading/writing tests. All nice and easy. Very friendly. Then we walked through the N-400 application.
The whole thing took maybe 20min total. Approved on the spot (both I-751 and N-400).
Should be getting my ceremony scheduled in around 4-6 weeks, so sometime in January.
No updates in my USCIS account so far (but the interview was only a couple hours ago).
Glad to be almost done. Good luck everyone!