Despite the fact that it is the most basic version and lacks both bells and whistles as well as design frills, it has a really chic appearance. When it is in action, it is really quiet; you can hear the rustling of the blades and the passage of the air, but there is hardly any noise coming from the engine at all. I've only ever installed it once, but the mounting holes for mounting it to the wall were obviously created according to the norm, so I mounted it on the holes from the ancient Polish "Dospel" — I sat down like a native. The construction is of very high quality, and the inside is completely watertight. It is true that the valve is a thin transparent film, similar to a diaphragm; nevertheless, it is entirely possible, should the need arise, to replace it with improvised materials. I cut it out and installed it, and I don't anticipate any issues with it in the future. Work - we'll see. So far I'm 100% satisfied.