Anything that adds a little air [oxygen] to whisky will benefit it, my only concern could be the loss of alcohol [especially cask strengths]. A number of the best blending companies use air to mix their blends together in large vats as it seems to enhance the mixing but they do lose a little on the strength. The aerators I've seen used on wine don't seem to be too hard on them so they should be ideal for whiskies.
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