I use one on my awning (brown). It DOES cut down the sun load under the awning and also deflects a lot of the rain from reaching the "patio." Especially the run-off from the awning.
In close CG quarters, it also adds a little privacy between rigs.
I leave it in the roller and roll it up with the awning during the summer. At the end of our season, I remove it, fold it up, and store it in an old tent bag.
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