If you liked The Trip, you will like this one, as it is basically the same movie. The same people, the same jokes, the same outdoors and food shots. The only thing that changed is that instead of 44, they are now closer to 50. Their hair is more gray and less. How they relate to the world has changed, children grew up. And, of course, they're in Italy.
To me, one of the failings of the film is that it doesn't really portray the places so well. I understand it's a character piece, but by limiting the surroundings, they also make the movie feel more like a play, diminished in scope, if not in meaning.
Still, if you watched The Trip and wanted more, watch this, too.