First, I don't/haven't used one.
Just remember, the Kestrel is only going to give you wind speed at your location. If the locations you are shooting is fairly flat/featureless, an area where wind speed could be constant all the way to your target, I believe it would be beneficial.
If your shooting area has wind speed/direction changes between you and your target I believe it could be detrimental - if the wind speed/direction of the shooting location is significantly different than the direction/speed along your path you may chase impact based on the wrong input.
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