I love my brown Bobarra Thoreau cover (Kindle 2). It's lightweight and slim, and the suede terra cotta lining is sumptuous in color and texture. After about a week of use, the leather broke in enough for the front cover to fold back completely flat, and it doesn't slip around. Like LibbyD, I appreciate the symmetry and traditional look of the four elastic corners, and the pockets are indispensable for commuter/boarding passes.
As much as I like the elastic corners' look, it doesn't feel quite as secure as the hinge system on the M-Edge and Amazon covers. My Kindle popped out when it fell off my nightstand -- no damage, mercifully, but it was a scary moment! I ordered the Bobarra case a few days before M-Edge released the Go! case, which I ordered in red. I used it for a while and initially preferred it to the Bobarra, but its flimsy spine allowed the front cover to flop around too much. The Bobarra case feels wonderful in the hand; it's sturdy but not bulky, and the lining delights my eyes every time they wander from the Kindle screen. It's a lovely cover.