Spigen is amazing. Just got it from Amazon yesterday. Fits like a glove. Looks like a work of art. Smooth. Slick. Comfortable. Flush with phone design, edges, camera, and physical keys (volume rocker and power button). Everything looks feels and works great. TOTALLY recommend this case.
I have a white GS4 with the Neo Hybrid Infinity White case. Black on white on black on white just looks slick.
And the back of the case provides enough grip that I can use the phone one-handed now. Seems to provide good protection overall as well. But I'm still gonna take REALLY good care of my phone regardless of having a case. I'm gonna baby this thing for as long as I can.