I got my Roo case yesterday and it makes the Fire MUCH more useable. A little more bulky to stick in a pocket, but still, much more useable. And it can be used in portrait mode which is great for just reading.
Is a little wobbly, not too bad to use tho. Yea, occasionally it'll come outta the groves. But overall those are very minor problems compared to how much more useful it is now.