Hi,
On my 640XL The text is not blurry, the screen is scrolling smooth, the touch sensitivity is good, the screen resuming quickly from any apps.
Definitely moving from the 520 to the 640XL will be good.:smile:
I have owned recently the 1520 and few year ago the iphone 5S, and I have decided to move to the 640xl because I have some issue with the network reception and the ghost touch screen with the 1520.
I am very satisfied with the phone knowing also I do no have to spend all my budget on "a" phone:
I can call people or receive a call, I do not have to charge the battery every night, I have my personal sim card and my business sim card in so I do not need two mobile phones, The 4g and H+ capabilities and the wifi is good enough for me to received/send emails, read the news, upload the photo to onedrive, I like the selfie 5MB camera and the 13MB camera which can give me some good picture if I do not move , Skype is ok, my 64GB micro SD card compensate the 8GB internal, the display quality is good for me with not too much finger print (oleophobic coating) and readable outside with sunshine.
This is not a ?600 mobile phone but for ?140 I think this is a very good investment and should be for a lot of people.