if you've scanned thru the threads, you see that a few of us traded our Titans in for S's for various reasons...For me it was the muffled sound on calls.
I have no regrets. The Focus S has proven to be a solid performer. There is a slight difference in the screens, but after a while, you wont notice. It took me longer to adjust to the size difference.
The button config is different, and yes the camera button is a slight inconvenience, but I came from the original Focus, so the power button was familiar, and a case will help out with the camera button.
I live in DFW, so network service is a wash, but the call quality is where the real improvement was for me...I can use the S without a Bluetooth headset, without anyone griping about not being able to hear or understand me, whereas on the Titan, I wouldn't dare answer or place a call unless my BT was close by.
I hated to do it, I really liked the Titan, but it has been 2 or 3 weeks for me, and my tears have all dried up. It is totally your call to make, but for me, switching to the S was a good decision.