Another. L930 user here.
Build 10166 can almost be used as a daily. Most of the settings work now, only a few just send u back to home screen. I really like the new personalization settings, new keyboard, backup options (not everything works yet) and the new word, excell, powerpoint, store. Awesome! I really like where this is going.
Now i know the store is just out of beta, but i cant install onenote, and it keeps trying to update the nokia account for some unknown reason. Apps i miss that arent inthe store yet or not working anymore: notes app,one note, lumia camera (cant launch with camera button and it says install from store,its not there), a seperate gmail app or live tile, VLC and a couple others.
Edge is nice but still kinda slow. Most problems occur on Windows Central site, which was crappy even before, but now it is even worse. The new browser could use a favorites shortcut when u open it, instead of a need to go under 3 submenus. Youtube links now open in full youtube site, works well but hard to press the small keys it has.
I can see a huuuuge inprovement of battery life compared to older builds (50% better at least). Everything is quite stable. No need to turn off the phone since install.
I have one strange problem tho. Outlook callendar is gone from start screen and it doesnt give me an option to pin it from the app list. Same thing with some other apps.
Also, i cant send or recieve MMS, no matter the celluar settings.
Third problem is the annoying you are near your data limit notification. Sometimes every 10 seconds or so, and it doesnt stop untill u turn on wifi.
Thats basicly it. I think the fast L930 processor helps with how this build works compared to slower lumia phones.