^ lol, 10 years warranty.
I have used a Emolux Wide angle convertor before, the image quality really sucks. It ended up like fish eye and it increases un-pleasing flare on my S5 IS as well.
However, I do not have any complains on Canon's 1.5X Teleconvertor, which increase my max range from 432mm to 648mm. IQ wise still great.