Besides this burn-in possibility, do any of you have problems with dust gathering between the screen and the quickcircle flap? It feels like something is giving off static and collecting dust from pockets. I carry my phone around in either jeans pocket or jacket pocket - different materials, and no, the pockets are not full of cookie crumbles or sand. The phone might be in the pocket for as little as few minutes, and when I take it out, you can see a clear coat of dust under the covers circle edges and at the top of the phone. No such problem without the cover.
Also, the plastic back of the cover is already pretty scratched, after about 2-3 weeks of use. Being the silver version, it really shows under light.
Quite bad for a 30 euro case, will probably revert to leather back. Would love to protect the screen though, but dont like any additional bulk.