[Hazem Khaled]

it looks great in PC, blury and we can change it's color but in WP10 it looks dull and boring

[Sagar Limaye]

I would love this. But I think it was not done because of performance reasons. Not all Lumias would be able to handle the blurring effect very well.

[iainberryman]

I think they should find a new design, I do agree that it needs some attention.

[Unauthorized]

I also like it on the PC. But if added on mobile, it should be possible to disable the transparency. I like the solid black background as everything is readable in sunlight, especially when using the "Assertive Display" technology of the 1520, which creates some extra contrast from the pixels on the display. This looks really ugly and unreadable for text on transparent background, thankfully there are only few of those effects until now.