GH2 Anyone used DMW-LW46 Wide Conversion Lens with 20mm f1.7?

[MaTeZZ]

I love the 20mm 1.7, but there are occasions, when I would like to add wider angle glass.
Here is a link to the lens description:
http://www.bhphotovideo.com/c/product/577413-REG/Panasonic_DMW_LW46_DMW_LW46_46mm_0_75x_Wide.html

Martin