I think the black on black iP5 looks pretty slick!
I'm using a 3Gs now so it's about time that I upgrade since it already feels so slow compared to a 4s. Everything lags on my phone now and the battery life is getting really bad, sometimes it's so slow I'm not sure if the phone froze or it's just loading.
Personally it's just that I'm "comfortable" with Apple products now and I'm simply too lazy to re-learn all the functions of another phone. I admit I am just a casual user. I would have stuck with my Motorola Razr if it didn't crap out on me. Then I was deciding between a 3Gs or a Berry.
Now that I've made the jump too Apple... I'm content. I don't care for those million and one extra features. I mainly use my phone to make calls, text, email and kill time on the toilet playing apps