It could be absolutely mesmerizing to watch this thing...after a few beers. But I'm afraid they'd need a fleet of these at my marina because sometimes there is a floating island of flotsam and jetsam next to the bulkhead.
Yes, marina staff (yacht club staff) have to empty them as needed. It will be of interest to see how they handle winter rains, which wash a lot of street junk into Santa Monica Bay after eight months of no precip at all.