First off, watch this with a pair of good speakers or at least a nice set of headphones. The soundscape by Simon Fisher Turner is strikingly incredible. I would say that the film is worth a watch if only for this.
Otherwise, it’s simply a travelogue with reflections from one end of the Berlin wall to the other. Some nice moments and interesting monologues keep the piece going but despite it being of interest it isn’t very interesting. Still it’s only an hour and it is Tilda Swinton after all so it’s worth the hour.