Before Sunset, After Sunrise, Before Midnight - and beyond?

I was (am) a big fan of the Hawke-Delpy-Linklater collaboratiaon Before Sunset, which I think beautifully captured the mood of young people at a particular time of life - somewhat established in careers and but not in relationships - as Hawke (Jesse) and Delpy (Celine) meet on a train and disembark together for one long night in Vienna - the beginning and, seemingly, the end of their relationship. Very moody and funny and endearing and a little bit sad, but you also felt that each was strong and talented and would go on to fine and successful lives, with this one night as a memory or pole star. But both seemed so real and imbued in the character - that many, including the 3 creators or the movie - were curious about exploring the course of these lives; the follow-up, After Sunset, in which Hawkes returns to Europe to promote a novel he wrote based on his night with Delpy - she seeks him out and they spend much time talking and reflecting - was to me drab and much less moving and provocative. This 3rd segment - each about 10 years apart, something like a fictive version of the Up series - Before Midnight - returns I think to the strengths of the first movie - funnier, equally credible (for the most part - though I can never buy Hawke's discourses about writing - even though H. himself is a published novelist - odd how phony these sound). Both Jesse and Celine are still endearing and at times charming, and also at times irrational and difficult and annoying - and this film examines, over the course, again, of one day, in about 8 scenes, most very long and most involving just the two of them - the course of their lives; at times they seem like a happy, quirky, joyous couple and at other times angry and embittered and selfish - Jesse virtually admitting to infidelities, Celine haranguing him about his oppression of women and how she's tied down by their twin daughters. The crux is they are wrestling w/ whether to move back to the U.S., at risk of C's emerging career - an issue so many couples face. Several of the long scenes could be classics for acting classes to analyze, and to try to re-create - which would be a real challenge (I wonder how much of their dialog was improvised, btw). Definitely a film worth seeing but only if you've seen the other 2 first - and I have a feeling more are to come, over time.