Nokia 520 is awesome phone of windows its all about quality.
Nokia 520 is nokias best phone in budget segment I used these phone last 1 year.
Pros:
Available in multi colour
Back case is matt finish
Screen visibility is good
Touch is also very sensible
Better internal storage
1080p videos also can play
Camera is also good specially lumia camera app
Call quality is good
Cons:
No music equaliser
512 ram
Display pixel density minimum
Some games cant run due to poor ram