Bought this phone last week,

Pros - so far the best RM500+ range phones, OS is smooth, gps is good and camera is best at this price range believe.

Cons - battery used up quite fast, the auto brightness seem abit too dim. The camera button is hard to press.
and being new to these lumia windows experience, i can safely say that access to software is kind troublesome, especially wifi and stuff where you have to go in settings to set whereas a android is one swipe away from it.

overall the phone is one of the best low end phone out there provided that the user utilize the gps and camera which is their strength in lumia phone!

one thing about 520.. is

the cover quality is really really lacking till the point it affects the buttons on the side.
so far this the most common problem i get back from my buyers.

if can fork out a bit of extra money, i reckon my buyers to go for 620. since should be noticing a minor price drop on 620 in the market.