I'm a guy, and I REALLY think that yellow and cyan phones looks like they're for girls. I get others feel differently, but I hate those colors for a guy's phone, haha. The white is a color I just don't like at all--for guys or girls. I think it makes me think of an iPhone by default, and I hate those. I wanted grey, but that's not in the U.S. That all meant it was black or red for me. I wanted to see them both before deciding, but I went to AT&T the day they released (Friday, 11/9), and they only had black. They said white should show up that afternoon (didn't want it, though), and that red would maybe be in Tuesday or so. I didn't want to wait, so they made my choice very easy, black it was.
In hindsight, I didn't want to wait, and probably still wouldn't. I wasn't going to pay a $35 restocking fee to switch, so that's that. I would have liked to get a more noticeable color like red (I normally don't go for bright colors, but I wanted this phone to get people's attention), but I was out of luck on that. I'll likely get a colorful (Chicago Cubs blue or something) cover for the phone, since the matte black is an extremely slick device.