Terrible. Apart from the fact that the image appears blurry all around, in the center it is not clear, as if it is shaking. Additionally, in the outline of a building, for example, the refraction of light is visible and the photo comes out with a red/yellow/green outline

Although it is made of plastic, if you put it on a tripod and make sure to focus correctly (manually, of course, first through the lens and then through the mobile phone), I would say it is worth it only for video when you want to shoot a concert in a theater. Anyone who complains that they can't see the image obviously hasn't turned the focus ring. It also won't be suitable for someone who doesn't have a steady hand or a stabilizer on their mobile phone camera sensor. Finally, it suffers from chromatic aberration.