I recently got both the Kandle and the Mighty Bright TravelFlex. I prefer the TravelFlex. The Kandle is more compact and has 2 LEDs, but the light is uneven. Although the gooseneck on the TravelFlex is a bit fiddly, it can be arranged to illuminate the screen fairly evenly. Also, I like being able to use just one AAA battery--I can use a rechargeable, saving money and reducing waste.
I'm sure the XtraFlex2 would give even better illumination (2 LEDs instead of one), at the cost of more bulk and weight for the battery case.
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