It works. I'm rooted an bootloader unlock with MDK, and I'll never get rid of it. But my wife's is a work phone. MJ7 build. Unrooted..fully stock. Free Foxfi app works. I tested it. Like others said, you MUST install the security certificate for it to work, and this MAKES you use a lockscreen pin or pattern. I have not tried any of the screen unlock tricks. Honestly, we all SHOULD use a screen unlock for security. Me I use one, and I use automateit app to bypass the lockscreen when connected to my home wifi. Best of both worlds. Lockscreen security away from home, no annoying screen lock when I'm at home.
As soon as an MJ7 rooted stock Rom is out, I will use that rom and test FOX Fi fully.