That really depends on what a "daily driver" is for you, so in the end you may or may not take our word on this. Is it safe? For phones that don't rely on external storage - probably yes. For phones that need external storage - most probably not yet.
In my opinion, build 10581 (most recent so far) is capable of being installed on one's daily device - it appears to be safe and pretty stable, considering that I'm using a relatively old Lumia 1020. I've never installed any preview builds before this one, so I did a straight upgrade from WP8.1. The basic functions, such as being able to send and receive SMS and calls, connect to WiFi and cellular data, launch apps (mostly weather and chat apps) and take photos and videos (of course!) all work as expected, with occasional hiccups but they're not major - these qualify this build to be sufficient for my daily driver.
11-04-2015 12:36 PM