Saw this on subscription, and fell in love with the funny, touching, heartwarming, tissue-guzzling story. Wanted to see it again right away but when i tried to buy tickets today i found out that the rest of the run to Jan 8th is already sold out. 
I hope that they will extend a week or two before moving to NY - they left a month in between and the DC run extended with the same time window between that and the TO run.
Anyway, it is definitely worth seeing. Comparisons to Once make sense in terms of musical style, although i enjoyed this music much more, and the book and story were beautiful. Jenn's song really got to me, both the pilot's moving backstory itself and then how it crashes into the reality of that day. And in the early part of the musical, right after the plane people arrive, I already started crying when the Newfoundlanders sang "I can't watch the news anymore" and needed to do something to help. I felt that way at the time and felt so helpless and unable to do anything about it, that i burst into tears early in the show, and ran through all my tissues throughout.
The suspicious New Yorker character was a hoot and provided lots of endearing laughs as well, mostly highlighting the differences between big city and rural life. I can't speak for everyone in the audience of course, but at least for myself, as a big city resident, i identified more with the New York character than with the Newfoundland characters in those little vignettes where they interacted, and the laughter was definitely the laughter of self-awareness, of relating very strongly with the big-city character's take on things when he first arrives in the town. I kept alternating between laughing and crying the whole time. It was wonderful. Go see it if you can.