Islay Peat, while I do not have personal experience with the aerator, here is some feedback given to me from a true whisky connoisseur which I feel you and possibly others may find beneficial:
There are only two elements that enhance the enjoyment of whisky and for that matter distilled spirits. That is pure water and air (oxygen to be precise). I am a true believer of the Vinturi Spirit or Wine Aerator, as it helps to induce oxygen into the spirit and unlock the nature aroma and flavor of the whisky, without stripping it of its chemical elements.
The BevWizard on the other hand is a clever little magnetic device, that strips the spirit of its astringent elements and thus changing the nature formula. It makes the whisky taste smoother and softer. If you like to do this to whisky then it’s a good device, but why would you destroy the flavor format? That’s just like adding a soda product to the whisky. So as a whisky connoisseur, this device is a gadget, not really enhancing the spirit for its natural quality.
I would recommend the aerator any day.
And... just in case anyone is wondering if by inducing air (oxygen) to the spirit, won't it negatively affect the spirit as we so often hear what happens with whisky over a long period of time? That answer is no and that's because you are inducing air (oxygen) into the spirit for a short period and consuming the product immediately. So yes, if you leave the whisky exposed for a long period to air, it will oxidize the spirit slowly and certain elements will evaporate away. As for what we are referring to here, that is not the case.