It is top phone for 2years. 5mp camera capture picture equal to the DSLR camera image quality. I have used for 3 years. 5mp camera is equal to the 13mp camera for android mobiles. and its Ram 512Mb is also equal to 1Gb RAM for android mobile. software troubles are less. if the lumia user have a PC, he can fix software problem for free of cost by using "windows device recovery tool software" this software not only for lumia 520. it can be used for any type of "Windows mobile".
design of the mobile is awesome body looking. and stylish phone not copied by other company models. for 1st time lumia user its difficult to use after some days they will like it.
but the bad thing is the battery life. for lumia 520 battery life is 1430mah battery. its not enough for mobile lovers.
In 2013 to 2015 its the best phone for Rs.6600. with all this features. but now they are lots of mobiles in the market.but the camera lovers loves the phone in cheap price.
some of the photos taken by me vth with lumia 520