Going on 2 months now using this device. In the past couple of weeks I have gone with my 950/XL just because I have them. Great devices they are ... however ... I have decided that I like the 4s (overall) as my main daily device.
The camera isn't Pureview I know ... I know I can get better results more often with Pureview. But for me that's not a deciding factor.
The Idol 4s is just so damn smooth operating.
The battery life on this thing is one of the main things I really appreciate. Phone comes off the charger at 7:30am --- 100% ... at 4pm that day, after heavy usage (for me) ... reading a lot of news stories, browsing thru the wonderful ReddPlanet reddit app, several text messages via built in SMS, watching a few YouTube videos via myTube! with those damn good speakers, browsing thru my pictures, streaming Slacker Radio/Groove via Bluetooth in my car to and from work ... at 4pm that day the device battery consistently has around 75% left. Not using Wi-Fi at work ... I get 2-3 bars of LTE while there. No phone calls.
I really do prefer this 4s over my 950/XL. However ... if I know I'm going to be somewhere that pictures/videos will be taken and I want to be sure I get some good shots/footage ... I'm taking my 950/XL (for OIS and 60fps). But the 4s is going to stay as my everyday go-to device. It's that good.