Finally got mine yesterday, I "upgraded" from the 4.
I don't know if it's psychological or not, but I find it much more pleasant to use, and swear that things just look better on the white i-devices. I had a black iPad1, got the white iPad 2, had the black 4, now have the white iPhone 4S, and swear that it's just more pleasant to look at, screen seems better & brighter....call me nuts.
Anyway, I did compare my 4 and 4S side by side and the 4S definitely does have a much brighter, more clear screen. My 4, compared to my 4S, is much dimmer, with a noticeably blue tint - and yes, the brightness was set to identical levels.
I had read that apparently some white iPhone 4 & 4S' are plagued with notably yellow tints, I lucked out & got a pretty perfect model, IMO.
Otherwise, it's a bit faster than the 4....doesn't seem night and day, but it's certainly slightly better. Was snapping pics last night, and it certainly can do multiple shots very quickly, so that's a welcome upgrade.
Browsing the internet is quicker, as is navigating inside most apps, of course.
Siri is very cool and I believe it will do what I wanted (the only reason I purchased the 4S, in fact) which is to keep me from texting while driving.
I'm just very disappointed that when you create a meeting with a person in your contacts, it automatically sends a meeting request. Maybe I'll come to love that, but for now, I wish it wouldn't, or wish that I could control the option.
Was also pleasantly surprised that Siri didn't censor my cuss word in a text to a buddy. :supergrin:
And sorry NRA Ninja - I gave my 4 to my sister.