Looking at the before and after images on the website it looks as if it does actually work. Having said that, why would you buy one. If you need that much zoom buy a camera as I can’t see the point in trying to zoom the camera on the iPhone. I love the images from the iPhone as I do the images from my LOMO’s but quality images they are not.
If you want to try one they are $19.00 from mobile.brando.com.hk.