The IO Gear light is nice, but what holds it in place?
A single red led is plenty for reading the keyboard. The illumination from the screen is nearly enough already. In fact, I have a red Infinity suspended about 2 feet over my keyboard right now. With no other illumination in the room, it is plenty bright. Without the Infinity, it is legible, but dull.
I would go for the Kensington, unless you can figure out how to suspend the IO Gear over the keyboard.