The characters, and the performers who portrayed them well.
What I didn't like
I would say the actors were a little stronger than the material. Not that the script was weak—it wasn’t!—but I’d call the script “good” and the acting “great.”
My overall impression
Two essentially independent two-person plays, interwoven together. Good script, characters with interesting arcs, strong performances. Plenty of humor, but also some more serious issues. Needs a sequel!