I've migrated over to Android now.
I actually prefer the design of Windows 10 Mobile in many ways (the myTube app is just brilliant), so I'm still using my BLU phone as a secondary device. I probably wouldn't have made the switch if the OS was stable. As much as I like the idea, UWP apps seem to be too much to handle for current mobile platforms. Windows 8.1, while vastly inferior to 10 in its feature-set, was actually pretty snappy on the BLU phone.
It'd take a lot to get me to switch back to Windows anytime soon as it seems Microsoft are leaving their current mobile customers behind to focus on a future OS. A real shame. And I just get the feeling history will only repeat itself.