I have been running 10166 as my daily driver (640) for almost as long as its been released.
The battery drainage on 10166 is much better than the previous build. I have been able to get through the day without a charge for most of the days. I don't remember ever being close to running out during the work, and that included a one hour Pandora session over Wi-Fi and normal work usage (email, calls, texts, nothing too strenuous).
If you can tolerate some of the idiosyncrasies, it should be okay. It all depends on what your definition of "small" is regarding issues. Here is a sample-
1) Occasionally, the screen will freeze after a call. Doesn't matter if it taken over BT or not. Remedy is a soft reset.
2) Notifications (calendar reminders, text messages) for me are sporadic.
3) WiFi calling doesn't appear to work yet.
I did have one issue that caused me to use the Windows Phone Recovery tool to get back to 8.1 to get back to 10166. My store wouldn't open at all, and a hard reset didn't work (I let the hard reset go overnight too).
If you can deal with a few of those issues, then its no problem at all. IMO. YMMV.
Carl
08-07-2015 02:57 PM