I've owned every iPhone so far and wouldn't be without it. I'm not sure if the 4S is worth the upgrade though. I like the look of Siri but am not sure how much I would use it. The new camera would be useful as I use my iPhone as my main camera. Extra speed is always nice. I guess it's just missing that killer feature. How are iPhone 4 owners finding the upgrade so far? Glad you made it or wish you'd not bothered?