I have been using the official Sony cover (red) for about 6 weeks and I am very happy with it. It looks very nice, feels very nice and since I only put my readers in my handbag, I think it offers enough protection - it's basically like the cover that came with the 505 and I have never had any issues with that so far. However, if I were to carry the readers in a backpack, for example, I would definitely put them in another container/bag as well, just for the peace of mind.