Just received my ink blue cover. Still waiting for my Paperwhite, so can't fully comment on it, but it feels pretty good. Not like some of the nicer leather products I've had over the years, but still good. I think the design is great, and the cover seems to nicely close. Not sure how well it will work with the cover bent backwards behind the Paperwhite - without the weight on that side, it seems to want to bounce back when held on the left side. Holding on the right side is fine.
Here are some pics: