After three days I have absolutely no issues with my iPhone 4. The reception is fine (I am using a bumper).
It is remarkably faster than my previous 3G. The camera is much improved. The resolution is superb.
I would buy it again without hesitation.
Indeed, I expect to in 2012 when iPhone 6 comes out.
I have an appointment at the Apple store tonight to reserve one. Yay!
How ridiculous is that initial sentence, by the way? 😉