The couple of things that I want out of a case are as follows:
Something that protects but doesn't add too much bulk. Part of the fun of a tab, for me, is how light and thin they are. Next, the case has to have a "lid" or a cover that makes use of the auto sleep function. I've really grown accustomed to that feature with my current rooCase. And it has to be able to fold back on itself. That cover is a must-have for me, BUT it has to get out of the way when I'm using the tablet. I don't want to have to use two hands, like I'm holding a big heavy book or something. And I don't find myself setting it down in one of the tilt-back positions anyway so no need for the multiple viewing angles set ups. Lastly, black is sooo boring... I like some color options.
Just my 2¢ worth...