Don't get me wrong ... I think that cover is beautiful (both in make and in function).
In my opinion, it negates the whole idea of the PB360's portability. When I owned other readers, I got a cover only to protect the screen. While I was at it, I got nice covers because I figured I might as well have something attractive. But, covers bulk up the reader, which cuts into my reason to have a reader - less bulk and easy to hold. As someone said here on MobileRead: I like my ereaders "naked."
They are just more comfortable to use.
So, while I admit the cover shown here is a pretty thing - I'll stick with the ingenious cover that comes with the PB360. It's light, attaches to the back so I don't have to worry about where to put it, it's functional, attractive and, most importantly, it gets the heck out of my way while I'm reading.