The nasal douche has an advantage: it served its purpose, and it has with the standard 250ml size in this market. Apart from that, one can only advise against it:
The biggest drawback is that you must press vigorously permanently when flushing on the headboard to keep open so the supply air. By comparison, the competition has just a small hole that you just hold must, if you want to stop the flow.
The next shortcoming is that the nose plugs (the "olive") needs to be laboriously turned 90 degrees to open the passage, which requires in the rubber strength. By comparison, the competition has tilted the plug as a lever tap; A handle is enough.
Finally, the nasal douche is in a form that is not flowing radicals provoked: The snacking shower principle is based on gravity and water, which supports higher than the nasal cavity. The competition has understood this and has a container shape, which is tall and slender rather broad and sweeping.
The material is high quality and looks a bit better than the competition, especially the Olive. The interested one after a day but no more: the second rinse the tentatively acquired competitors had made the race with me. Priced are anyway both in the same league.