Uavwmn,
I have used the Vinturi wine aerator. What I've noticed is as follows...
If you have two glasses of the same wine that have just been poured, the Vinturi glass will express more nose and seem more 'opened up' than the non-aerated glass. The more time that passes, however, the more the two glasses will end upbalancing themselves out to equal. I've noticed this balancing time to be as short as a few minutes in some cases.
To me, nothing can replace time in a glass (or partially-filled bottle). The Vinturi will not give me the same effect as repeated swirling over the course of time. However, I use the Vinturi when pouring out red wines for a blind tasting where people are going to be tasting the wines right away and side-by-side. The thought there is that by the time the wines aerate themselves naturally through swirling, the Vinturi will help a bit.
When I'm consuming wine for my own benefit and enjoyment, I do not use the Vinturi as then I'm much more interested in how the wine changes over time and with air exposure that I enjoy the first impressions as a sort of bookmark in my mind.
- Jim