Anyone use the DevilCase bumper for your S4? I can't find their product for S4, but there are iphone and HTC One bumpers at Amazon. The only information I got is from their FB fan page when I google search S4 aluminum bumper. There is a cool video to introduce their bumper for S4. It looks great and sturdy. I don't know if it has been sold out or just released.
https://www.facebook.com/pages/Devilcase-Aluminum-Alloy-Bumper-Series/448520031891616
https://www.facebook.com/pages/Devilcase-Aluminum-Alloy-Bumper-Series/448520031891616