Got this from BB and have to say that I love it. I noticed in the seat pocket of the plane that the "naked" Kindle would turn itself on and I was worried that the screen would be damaged so I picked this up on my trip and was much less concerned on the return flight. I love that the Paperwhite snaps in there snugly vs some of the other generic cases that just use little elastics over the corners...I'm not at all worried that this will accidentally slide out or the elastics will break. The case also recesses the power button a little so it won't accidentally get pressed in most situations. I also like that the screen goes on and off when you open and close the case which will save the power button in the long run!
There have been some reviews that suggest that the case adds bulk and weight, but any case will do that and the tradeoff of the extra protection is well worth the compromise. That said, the "bulk" added by this case is very minimal as this fits like a second skin. As for the weight, unless you went with some sort of ultra-lightweight material (that likely would not protect as much) I doubt you'll find too many cases lighter than this.
Overall, I'm extremely happy with this case and would recommend it to anyone with a Paperwhite reader!