My husband had his citizenship interview today and passed! Five-year rule at the San Diego office, and same-day oath so we are all done with USCIS!
However, the interview was VERY stressful - the worst interview of our whole immigration process. The interview lasted almost a full hour! The problem mostly stemmed from a name mix-up in the background check, which we had no advance knowledge of: apparently there's some guy with the same name as my husband working in a neighboring city in the Martial Arts field, and the interviewing officer spent a long time trying to trick my husband (who does not work at all) that he was that guy, or that he was trained in military/martial arts. That led to lots of probing questions about our finances (which are very normal and nothing out of the ordinary) and some attempts to sort-of bully or trick my husband regarding his lack of martial arts training! In the end, it all worked out - and in retrospect is kind of funny, once we googled the guy with the same name and figured out who they thought my husband was - but during the interview itself, my husband felt really stressed-out ... because how do you prove you're not that guy?
Other than that issue, the civics test was easy (although they did ask one of the harder questions, who was President during WWI) - but my husband answered all six correctly so no problems there, and of course English test no issues.
My advice to anyone with a slightly common foreign name is to Google your name thoroughly - if my husband had known in advance that he had a doppelganger in a military-adjacent area, he would have been able to explain/answer much more easily and been more relaxed. Other than that, no complaints and we're REALLY glad to be done with the process!