If I were getting a bumper case, I'd wait until some 3rd party ones come out. I don't like the fact that the Apple bumpers don't fit too tight (as some have reported), the fake buttons on the case, or the price (I know, overstated, but still). With that said, I like the black bumper more.
had the black... picked up the white today... I prefer the white since everyone already has black.
I have a black iphone 4. I would really like the white iPhone 4 and white bumper but I had a black bumper on it and it looked great but my son chewed through it and ruined it so I got a white one an it seems to fit the phone much better with less play around the edges and I like it much better than the black! It makes the phone stand out a lot and doesn't look like im holding any other black brick device. I love it.
look like the ones from SWbox, cheap and buttons feel off before i put it on the iPhone.