So, on my personal iPhone SE, I've had the camera "freeze" on me twice when trying to open it to take a picture. Meaning, the camera app would open, but the viewfinder was blurred and would not un-blur so that I could take a picture. A reboot fixes this. It has happened twice since updating to 10.1.1.
On my Work iPhone 5S, it has randomly rebooted twice, within a week after the 10.1.1 update, and hasn't done it since. Also, Touch ID fails a LOT, even after re-registering fingerprints. (It always works on my SE and it's not like my hands or the sensor are dirty).
Battery life on the 5S seems to fluctuate day to day, but on the SE it is as solid as a rock.