I got mine on Friday and I'm pretty happy with it. I'd dropped my 3G one too many times, and shattered the screen about a month ago, so I was definitely ready for an upgrade.
And while the 4s may not be 'The Most AMAZING Phone Evah!!!!!1111!' it is a Hell of an improvement. Calls sound good, and it hasn't dropped any for me so far. It's incredibly fast, camera works nicely, and Siri's a lot fun.
My one complaint is that that the glass on the back makes the phone a lot more slippery, so it doesn't balance as well as my last one. BUT...as I'd broken that phone by tossing it across the room, it's probably good that I'll have to put a case on this one.