I'm very pleased with this protective cover for my new Nook Simple Touch.  It's easy to install and remove the Nook.  Unlike my previous cover (which I lost along with my Nook on a backpacking trip), this cover holds the Nook by way a pair rugged plastic tabs that perfectly fir the little detentes in the top and bottom edge of the Nook.  (I never knew what those detentes were for before getting this cover).  At first I was a little skeptical about how securely the Nook would be held in place, but it's not a problem - they hold quite securely.