Camera Lens Kit for Iphone 4 / 4s

Has anyone ever used Camera Lens Kits for Iphone 4 / 4s? These days I saw many camera lens kit for iphone 4/4s on the internet. I had never used this kind of product. Here are some overviews about camera lens kit for iphone 4/4s.

I.a broad range of features, a large group of people, beautiful landscape and architecture, a shot with a close range for small objects?

II.expands the iPhone's photo types to include fish-eye, wide-angle, and close-up shots.

III.The Fisheye lens is the largest of the three and Wide-Angle and Macro lens are a precision set , with the Wide-Angle lens screwed on to the Macro lens, which is permanently seated within the equipment.

Anyone has any ideas? Thank you so much.