I just have the case.
I ordered it from amazon. I actually like it a lot but it did seem to mess with wifi even though it says its been updated.
I could put the back plate on and I'd drop one wifi bar and remove it and gain the bar.
I will say that after a little while with the back on wifi seemed to stay at full wifi.
Just my experience
That said I really like the style of the case, feels good in the hand and didn't seem to bother the speed of the wifi, only the bars it showed