You can imagine Chaplin turning the conceit into a feature, Prince and the Pauper style. As the rich drunk he provides the film's funniest sight joke (from crying to mixing the drink) and the golf sequence is a decent set piece, but when the two identities meet there isn't so much material to sustain it (I was hoping people DIDN'T think they looked alike).
Although I prefer late Chaplin to early Chaplin - "The Idle Class" is hilarious. Chaplin's light-hearted barbs at the rich are always appreciated. prefer his darker, more savage critiques of Capitalism ("Monsieur Verdoux," etc) but - hey, It's Chaplin. What more needs to be said? He had more talent in his foot than most "actors" or "directors" have in their entire bodies. Even when he's bad he's great.