for casual selfie and illstration, can use. I find the wide angle feature good for the obvious reasons. - using one photo to show more.
but if u are intending to use for holidays or for print outs where you want to have clear pictures, dont use it.
the edges are will be distorted/blurred. and there will be streaking by light rays (i forgot the correct term for this) due to inferior lenses. Even more reputable clip-on lenses made by Olloclip suffers from the same issues.
unless u are talking about this
https://www.youtube.com/watch?v=l1HBK35qA0c