I am using these phone from last past 2 years, nothing problem even now I face.
Pros:
Snapdragon processors
Even 1080p video can play
Windows 8
Good screen visibility and good touch
Great windows experience
Good call quality
Ram management is also good never hang
Compact and powerfull
Cool multi colour pannels
Cons:
No equaliser
Small battery capacity
Screen resolution
No windows 10 update
Poor earphone.