Lenses and lenses there are too Hauf for the iPhone, but most need to be cumbersome glued to the device or adjust only to a specific Bumper with threaded socket. This here but are quasi like a clothespin simply clamped to the phone - very convenient. But you have to fumble a bit so the lens sits nicely centered on the camera, it works quite well: the macro lens provides beeeindruckende images that wide-angle lenses are also quite nice. The image quality is hardly affected, but you can no longer use the built-in flash decent.
Of course, one must not expect miracles here, for this price but a fun trip to the world of macro photography!