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Works better than I expected.
The Flash extender focuses and concentrates light in a narrow central area good for telephoto lenses. It's surprising how strong the light is in the central area. The construction is reasonably solid, probably compromising a little in sturdiness for light weight. The construction is not cheap. It may be a little difficult getting the proper exposure with the extender, so a few test shots may be needed. I'm very happy with the product. I would recommend it to other. Be sure you match you flash...
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The Harbor Digital XT Flash Extender Kit for Canon 600EX RT Speedlights can add up to two f/stops of exposure at 100' (30.48 m) from the camera. Just mount the XT Extender directly to your Canon 600EX RT using the included mounting system (no straps or touch fastener required) and you're ready to shoot at a distance previously too far for your flash to reach on its own.