I had to go back to my M8 yesterday. I went back and returned my 2'nd unit of the 930 and just cancelled my purchase. Just could not catch a break with the screen. First unit had horizontal gradient on gray colors. Second unit had vertical gradient instead that I didn't notice right away because I was so happy the horizontal gradient from first unit was gone. Won't bother with a third unit. The screen uniformity issue coupled with the much worse battery performance made me do it.
Also the camera performs much worse in low light than my M8. Purple colors starts to appear and general white balance was bad in the dark. Much better on the M8 as I did several side by side comparisons since I had both with me at most times.
yeah, I also had major issues with the screen, and yes, the M8's camera, albeit low-res, yields better results than the 930's in many situations, especially for low-light and indoor shots. The 930's camera is outright useless for moving subjects, such as your kids.