I just got my "Invisible Gadget Guard" in today's mail. It only took a minute or two to apply, and now that a few hours have passed - even *I* can't tell it's there!
Unlike similar screen protectors, this one is custom-cut to fit the BB8520, right down to the little 'separators' between Send&Menu, Escape&End keys. Highly recommended!
It works. I don't like how dark it makes the screen though... I had to bump the brightness up to something like 80% rather than 10%...
Also if you get a email or text while the phone is laying on a desk, you can't read the screen anymore at an angle, so you have to pick it up to actually look at it. That got old for me...
Hi, I use Invisible Shield by ZAGG and it is awesome. Pre-cut to fit the 8520/8530 screen and application is fairly easy but you must follow the instructions and keep the screen protector moist to wet when applying it. It is available in www.ShopCrackBerry.com store. I think it was about $14. Hope this helps.