Reality.
The cats were hesitant to start using it. Since then, one of them will only drink from this, while the other prefers to avoid it. The fountain itself is useful because it really does circulate the water nicely, keeping it "clean and fresh". Unfortunately, the interior design is completely thoughtless. The inner ribbing, the bulge for the cable, and the plexiglass part imitating the nose and whiskers all start to get algae very quickly, and the filter system can't do anything about it. Despite all this, our bigger cat likes it.