Someone posted a review of that Octovo light, either here or another kindle forum. They liked it and said it did a good job of lighting.
The hinged case uses two metal curved "pins" that fit into slots on the left side of the kindle's edge. So leverage by pulling the back cover and kindle strains that edge. The "pins" are flat blades - there are pictures on their site, I believe.
Not running on a treadmill, I don't know how bouncy it becomes. Since I get "sea sick" in a car I don't think I could read on a treadmill. The Amazon lighted cover does add some heft to the unit so it might stay still.
I don't think the smak-dab will mar the kindle. It is a vinyl coats metal - it can be tweaked by bending to loosen/tighten its grasp.
I'm still thinking about that metal case noted above. Just for placing the kindle in my hiking pack on summer outings.
One potential warning, the Amazon UNlighted case seems to be implicated in reboot issues. There are some threads about that.
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