Messi62

hi everyone.. so just sharing my experience here as i used to visit this site frequently. iam a VSC filer . filed ROC in Nov 2017 although i was eligible in Aug. (got Lazy lol) Got the 6 mon extension like everyone. Filed N-400 as soon as i was eligible in Aug 18.. same drill biometrics bla bla.. had my combo interview on 31st Jan 19. both were approved and updated same day.. interview was very simple like other ppl have mentioned in this. Although my wife was present they only interviewed me. Case status was updated to card being produced but won't have to bother cause yesterday i got an email saying iam scheduled for Oath ceremony in 2 weeks. DONE.
If your i751 case file is also at the local office where your naturalization interview is scheduled than most likely its a combo interview. if your i-751 file is some where else than only the n-400 interview with the tests and all and you will have to wait until the i-751 gets adjudicated. These are separate cases and lot of times they don't even know your i 751 is pending until ur n-400 interview day. I asked my interviewer why so much delay than he said the i-751 cases are not priority. Naturalization cases are. i saw other people in this forum had gotten similar answers.
So filing n-400 seems like the right path if thats your end game so that ur case will get some attention. I was not notified of the combo interview  but you should go with your spouse regardless. I had a combo interview just cause my i751 file had already been transferred to the same office. I did not take any additional documents other than wht was listed on the n-400 interview notice. My EAC no was 18045... but  i think its waste of time cause its all random anyway. probably depends on where and which pile ur file is sitting on. Also I travelled abroad multiple times with the extension letter. Also went on a cruise with the extension letter. never had any problem anywhere. 1000s of ppl travel with this. They know. Good luck!!