Canon Smart Shade Control - Better WDR?

Canon promotes a technology called smart shade control, it is promoted to be:

"even more effective than WDR technology because it keeps the bright area that are correctly exposed in the image and focus on under-exposed area to enhance their exposure. As a result we gain dramatically in terms of details in under-exposed area without losing details and quality in other parts of the image."

Have you tested this technology before?

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