Default Nexus 5 metal bumper!

Just found this last night:
http://www.casefanatic.com/lg/nexus-...etal-bumper-3/

Does anyone have any experience with it? I'm mostly concerned about signal/gps degradation. However, since it's only a bumper it shouldn't mess with it should it? I'm somewhat worried about if it sticks out enough to elevate the camera, but that's a secondary concern to the signal loss. What do you guys think?

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