I use Microsoft Lumia 640 XL !
It's a Super Phone !
Don't Have Any Issue till Last Two Months !
Compared With Nokia Lumia 820 ( My Old Phone ) 640 XL Very Good !
Features I Like :-
Good & Long Battery Back Up
Screen Resolution
Playing Full HD Video Songs Smoothly ( 700mb+ )
Living Images
Only Problem is It's Flash Light , It's a Low Compared with Lumia 820 !
Overall at 14250₹ , It's a Worth Buying Phone .