I accept that the Otterbox does add more than a little bullk to the device, but I actually find the bevelled edge makes it much easier to grip onto. Without it, I'm clinging on to the slipper edge for dear life.
What the Otterbox seems to have over the other similar cases is the outer cover, which doubles as a stand (two angles, depending on which side you use). I put this on the front and throw it in my bag without a fear in the world. If you use it as a stand it is great if you just want to view the screen. In the stand it does tend to "wobble" a bit if you're using a notebook/drawing app and you're writing near the corners, but that is just because it's resting in the stand, and there is no method of clipping it firmly into position.
In short, if you take your Note 8 out and about with you, and you don't want to have to keep holding it like a newborn baby, then get one of these before it's too late. If you don't take it out and about with you, then you should've bought the 10" note! :)